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Cold Customers

Return of the dark-eyed juncos

By Susan Campbell

“The snowbirds are back!” No, not the thin-blooded retirees: They won’t be back until spring. These are the little black-and-white sparrowlike birds that appear under feeders when the mercury dips here in central North Carolina. They can be found in flocks, several dozen strong in some places. And, in spite of what you might think, they are far from dependent on bird seed in winter.

Dark-eyed juncos are a diverse and widely distributed species. Six populations are recognized across the U.S., Canada and Mexico. Slight but noticeable variations in appearance constitute the difference in these populations. Some have white wing bars while others sport a reddish back and the birds in the high elevations of the Rockies are recognized by extensive pinkish feathering on their flanks. Our eastern birds are known as “slate-colored juncos” for their dark brown to gray feathering. They are accustomed to cold temperatures whether in summer or winter. As with most migrant songbirds, their migratory behavior is based on food availability, not weather. Flocks will fly southward, stopping where they find abundant grasses and forbs. They will continue on once the food plants have been stripped of seed.

Dark-eyed juncos can be found throughout North America at different times of the year. During the breeding season, juncos are seen at high elevation across the boreal forests nesting in thick evergreens. Our familiar slate-colored variety breeds as close as the high elevations of the Appalachians. You can find them easily around Blowing Rock and Boone year-round. These nonmigrants actually have shorter wingspans as a result of their sedentary existence. Watch for male juncos advertising their territories up high in fir or spruce trees. They will utter sharp chirps and may string together a series of rapid call notes that sound like the noise emitted by a “phaser” of Star Trek fame.

In winter, flocks congregate in open and brushy habitats. Juncos are distinguished from other sparrows by their clean markings: dark heads with small, pale, conical bills, pale bellies and white outer tail feathers. Females have a browner wash and less of a demarcation between belly and breast than males. They hop around and feed on small seeds close to ground level. Some individuals can be quite tame once they become familiar with a specific place and particular people. Juncos do communicate frequently, using sharp trills to keep the flock together. They will not hesitate to dive for deep cover when alarmed.

So, the next time you come upon a flock along the roadside or notice juncos under your feeder, take a close look. These little birds will be with us only a few months, until day length begins to increase and they head back to the boreal forests from whence they came.

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The Powerful Fox Sparrow

Large, handsome and hard to spot

Sparrows are a common sight throughout central North Carolina in winter. Historically, eight different species could be found in a day across the Sandhills and Piedmont. The gregarious, prolific and very adaptable house sparrow was added to the mix in the 1800s by early settlers who yearned for a familiar bird from the Western Hemisphere — as well as a means to control insect pests associated with human habitation.

At this time of year, the largest and most handsome of the sparrows is inarguably the fox sparrow. It’s also one of the hardest species to find. Perhaps because of its size and brighter coloration, it is frequently hidden in the vegetation. The fox sparrow is typically over 8 inches in length and very stocky, with bold rufous streaking on its underparts. From the head down the back to the tip of the tail it is a “foxier” reddish in color. Several races of the fox sparrow exist in the U.S. and Canada, with those found farther west being browner all over.

The fox sparrows that we see in winter breed from northern Ontario east to Newfoundland and south into parts of Nova Scotia. They move south in fall and start to appear in North Carolina in October. They seem to flock loosely with other sparrows and finches during the colder months. They prefer habitat that is immediately adjacent to water. Although they eat mainly insects during the summer, in winter seeds and berries tend to make up much of their diet.

More often than not, fox sparrows can be found in expanses of bottomland forest, kicking vegetation and debris for food, though there are lucky backyard birdwatchers who regularly observe them taking advantage of millet and other small seeds under their feeders. During very cold and wet weather, they may move farther into drier areas in search of a meal. I don’t usually see them where I live unless it snows — our predominantly grassy yard is too open to appeal to them. However, we have wet woods with dense tangles of evergreen vegetation not too far away.

Because of their size, fox sparrows are quite strong and capable of uncovering food that is buried deep in the forest floor. They will actually use both feet together to scratch and dig beyond the reach of other small birds. If you are out in wet habitat — or if you check under your feeders after a mid-winter snowfall — you may be treated to a glimpse of one of these handsome and powerful birds.

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Cleanup on Aisle 9

The unparalleled scavenger

By Susan Campbell

There! By the edge of the road: It’s a big, dark bird. It looks like it could be a wild turkey. But . . . is it? A closer view reveals a red head and face with a pale hooked bill, but a neck with feathers and a shorter tail. Definitely not the right look for a turkey — but perfect for a turkey vulture. This bird is also referred to as a buzzard or, for short, a “TV.”

Making an identification of these odd-looking individuals is somewhat harder these days since wild turkeys have made a good comeback in the Piedmont of North Carolina. Turkey vultures and turkeys can occasionally be seen sitting near one another in an agricultural field where they may both find food or are taking advantage of the warmth of the dark ground on a cool morning.

Turkey vultures, however, are far more likely to be seen soaring overhead or perhaps perched high in a dead tree or cell tower. They have a very large wingspan with apparent fingers, created by the feathers at the end of the wing. The tail serves as a rudder, allowing the bird to navigate effortlessly as it’s lifted and transported by thermals and currents high above the ground. These birds have an unmistakable appearance in the air, forming a deep V-shape as they circle, sometimes for hours on end.

It’s from this lofty vantage that turkey vultures travel in search of their next meal. Although their vision is poor, their sense of smell is keen. They can detect the aroma of a dead animal a mile or more away. They soar in circles, moving across the landscape with wings outstretched, sniffing all the while until a familiar odor catches their attention.

Turkey vultures are most likely to feed on dead mammals, but they will not hesitate to eat the remains of a variety of foods, including other birds, reptiles and fish. They prefer freshly dead foods but may have to wait to get through the thick hide of larger animals if there is no wound or soft tissue allowing access. Toothed scavengers such as coyotes may actually provide that opportunity. Once vultures can get to flesh, they are quick to devour their food. With no feathers on their head, there are none to become soiled as they reach into larger carcasses for the morsels deep inside.

Vulture populations are increasing across North Carolina — probably due to human activity. Roadways create feeding opportunities year-round. Landfills, believe it or not, also present easy meals. In winter, the northern population is migratory and shifts southward, so we see very large concentrations in the colder months. The large roosting aggregations can be problematic. A hundred or more large birds inhabiting a stand of mature pines or loitering on a water tower does not go unnoticed. 

Except for birdwatchers and those who live near a roost site, most people overlook these impressive birds. Often taken for granted, they are unparalleled scavengers, devouring the roadkill our highways inevitably produce.

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Surprise Sightings

The rarest of hummingbirds

By Susan Campbell

If you happen to look out the window and see a flash of white at your hummingbird feeder or flowers, you may not be imagining things. Typically, late summer is when I receive a report or two from hosts who have glimpsed a rare pale-colored hummingbird. Birds in unusual plumage tend to be noticed and, given the network of bird enthusiasts I am familiar with, reports of unusual hummingbirds find their way to my phone or computer pretty quickly.

White hummingbirds include both leucistic (pale individuals) as well as true albinos (completely lacking pigment). Gray or tan hummers are more likely than full albinos. Light-colored individuals have normal, dark-colored soft parts such as dark eyes, feet and bills. Albinos, on the other hand, are very rare. These snow-white birds sport pink eyes, feet and bills, and have been documented fewer than 10 times in North Carolina. To date, only three have been banded and studied closely in our state.

It isn’t unusual for people to think they are seeing a moth rather than a hummingbird when they encounter a white individual, not realizing that these beautiful creatures are even possible. In fact, we know very little about white hummingbirds. Opportunities to study these unique individuals are few and far between. What we do know is that they tend to appear in July or August as young of the year and do not survive into their second season. White feathers are very brittle and likely cannot withstand the stress of rapid wing beats and long-distance migration. Another very curious characteristic is that all these eye-catching birds have been females. So, it’s likely that this trait is genetically sex linked.

The first white hummer I managed to band was a creamy bird in Taylortown, near Pinehurst, over 20 years ago. She was an aggressive individual that roamed the neighborhood terrorizing the other ruby-throateds. The first true albino I documented was in Apex, and that individual was even more aggressive; chasing all the other birds that made the mistake of entering her airspace. To have a chance of studying a white hummer, I must get word of it quickly before the bird heads out on fall migration. I have missed more than one by less than a day.

Just recently I heard about a white hummer in the Triangle area. Excited, I followed up and received permission to try to band the bird. She was mixed in with dozens of other hummingbirds using feeders and flowers on a rural property outside Chapel Hill. Although it took two tries, I was able to get her in-hand. This beautiful hummer was very pale, but had some gray in the tail as well as some tan marbling on the back. Her eyes, bill and feet were still the expected black color.

I hope to hear about another of these tiny marvels before all of the hummingbirds in central North Carolina have headed south. Each one is so unique.

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Brilliant and Blue

The surprisingly complex blue jay

By Susan Campbell

The blue jay is one of those species most of us instantly recognize: a common bird of woodland and backyard. But how well do we really know it?

This medium-sized, raucous bird can be found at feeders or flying around in treetops at any time of the year, but it hardly seems remarkable at first glance. It turns out that they are more complex and unique creatures than you might think.

Jays are closely related to crows, which are a highly evolved species. As a result, jays, too, exhibit a relatively advanced degree of intelligence. They have complex social systems. Blue jays remain together as a family for a relatively long period and also mate for life. These birds have dingy gray under parts and upper parts that are various shades of blue with gray and black markings as well as a blue crest.

Not only do they communicate with their voices, but also with body language. Changes in the jay’s crest are one of the most obvious ways they express themselves. Not surprisingly, it is raised when an individual is alarmed or is trying to be intimidating.

The unique black lines, or brindle pattern, on individuals is no doubt recognized by conspecifics. Interestingly, the pigment found in jay feathers is produced by melanin, which is actually brown. It is the structures on the barbs of the bird’s feathers that cause light to reflect in the blue wavelength.

In addition to their bright coloration, jays attract attention with their loud calls. They make a variety of squawks and screams, usually from a perch high in the canopy. Furthermore, they are known to mimic other birds’ calls, especially hawks. Whether this is an alarm tactic or whether they are trying to fool other species is not clear. The great early ornithologist John Audubon interpreted this as a tactic that allowed blue jays to rob nests of smaller birds such as warblers and vireos that were scattered by the hawk sounds. Modern studies of blue jay diets, however, have not found that eggs or nestlings are common foods. In fact, in feeding trials, this species is often outcompeted by other jay species, woodpeckers and blackbirds.

Another mystery is why, in some years, these birds migrate and some years they do not. Blue jays are particularly fond of acorns. So it may be that, in years when oaks are not very prolific, jays move southward in search of their favorite food. How many blue jays will remain in the Piedmont and Sandhills this winter will depend on the mast crop — especially the abundance of white oak acorns. These birds are very capable of gathering seeds in a specialized pouch in their throat and carrying them to nearby holes or crevices where individuals will stash them.

Blue jays have very definite nesting duties. Males collect most of the materials: live twigs, grasses and rootlets. The females create the large cup, incubate and brood the young birds. All the while the male feeds her and then forages for the tiny nestlings. Once the young have developed a good layer of down, the female will join the search for food for the rapidly growing family. It is not unusual for young jays to wander away from the nest before actual fledging occurs, though the parents are not likely to feed the begging youngster unless they return to the nest. It is during this period that people may “rescue” the wayward youngsters.

Finally, reports of “bald” blue jays are not uncommon. Do not be surprised if you see an odd-looking individual at a feeder or bird bath with virtually no feathers on its head, just dark skin. At first this was thought to be caused by feather mites that can be found on all birds to varying degrees. Now it seems there are simply individuals that lose all of their head feathers at once instead of in the normal, staggered fashion. This is more likely in adolescents who are undergoing their very first molt.

The next time you notice one of these noisy, crested blue birds, take a closer look. Blue jays are fascinating — and full of surprises.

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Call of The Wild

The summer sound of the Eastern forests

By Susan Campbell

It is the sound of summer: You may not be paying attention, but it’s there. The slurring “pee-a-wee” of the eastern wood-pewee is echoing all over central North Carolina at this time of year. On the hottest of afternoons this bird continues to call even though its brethren are now quiet. The spring cacophony of breeding birds may have been replaced by the buzzing of cicadas and chirping crickets, but the pewee continues making his trademark vocalization. The species has long been considered a hallmark of Eastern forests. Although not as plentiful as it was before humans began altering the landscape, it can still be found widely throughout the region.

Eastern wood-pewees are flycatchers: carnivorous birds that have the talent for snapping insects out of midair. They are acrobatic fliers that use a perch to scan for large, winged insect prey such as dragonflies, butterflies, moths and beetles. As a result of this foraging strategy, pewees spend much of their time in the open during the warmer months. However, if it were not for their loud calls, these little birds would be easily overlooked. Both males and females are a drab gray-brown above, dusky below, and have buff barring on their wings.

Flycatchers found in the Eastern United States are, as a whole, not a colorful bunch. They tend to be brownish with subtle differences in bill shape, tail length or the color of the small feathers on the wing or around the eye. Habitat may lend a clue, since they have preferences for different types of vegetation. When they vocalize, however, it is a different story. In fact, the eastern wood-pewee has virtually indistinguishable plumage from the western wood-pewee, which is found closer to the West Coast. The western wood-pewee makes a nasal “bree-urr” call that has a much rougher quality in tone. These birds may give a thin, whistled “peeaa” as well. Generally, the quality of the vocalizations is very different from that of our Eastern birds.

Given their diet, the eastern wood-pewee is not likely to appear at a feeder. However, this species may frequent birdbaths or water features within their territory. Also, individuals tend to use the same perches for foraging and can be found predictably in an area. They prefer forest edges so they’re easier to spot than their forest-dwelling cousins, such as the Acadian or willow flycatcher. Pewees also hover for very short periods to catch prey, and will actively move through the vegetation in search of caterpillars and slower moving insects in the canopy. They tend to utilize the midstory in locations where there are deciduous trees. As a result, it is believed that their occurrence in some areas of the Northeast has been affected by the over-grazing of white-tailed deer. The loss of smaller trees and shrubs has eliminated not only pewee perches but the necessary vegetation for their prey species.

Female eastern wood-pewees build a shallow cup nest of woven grasses lined with plant fibers, animal fur and/or moss. It’s well camouflaged on the outside with lichens and blends in with the horizontal limb that it is built on. Pewees have a limited ability to defend their eggs and young, so invisibility is the name of the game.

These little birds are migratory, spending the winter months in South America, where prey is abundant. Eastern wood-pewees can be found through Peru down into Brazil during the non-breeding season. They become active, solitary hunters that pursue prey in a variety of habitats that time of the year.

Before they begin to head south in August, see if you can spot one of these vocal, talented fliers. You may have to look closely to find this familiar summer friend motionless on a favorite perch.

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The Black Crows

The same music but different lyrics

By Susan Campbell

Everyone knows what a crow is, right? Well, no. Not exactly. It is not quite like the term “seagull,” which is generic for a handful of different species found near the coast. When it comes to crows, you can expect two species in central North Carolina in the summertime: the American crow and the fish crow.

Telling them apart visually is just about impossible. However, when they open their beaks, it is a different matter. The fish crow will produce a nasal “caw caw,” whereas the American will utter a single, clear “caw.” That familiar sound may be repeated in succession, but it will always be one syllable. Young of the year may sound somewhat nasal at first, but they will not utter the two notes of their close cousin, the fish crow.

Both crows have jet black, glossy plumage. They have strong feet and long legs, which make for good mobility. They walk as well as hop when exploring on the ground. They have relatively large, powerful bills that are effective for grabbing and holding large prey items. Crow’s wings are relatively long and rounded, which allows for bursts of rapid flight as well as efficient soaring. The difference between the two species is very subtle: Fish crows are just a bit smaller. Unless you have them side by side, they are virtually indistinguishable.

Fish crows are migratory in our part of North Carolina. By the end of the summer flocks of up to 200 birds will be staging ahead of the first big cold front of the fall. Most of the population will be moving eastward come October. For reasons we do not understand, some fish crows will overwinter in our area. Other small groups are being found on Christmas Bird Counts each December across the region. Not surprisingly, the number of fish crows along our coast swells significantly by mid-winter. Visiting flocks do not stay long and are our earliest returning breeding birds, arriving by early February for the spring and summer. Almost as soon as they reappear, they begin nest building. Their bulky stick-built platforms are hard to spot, usually in the tops of large pines. Furthermore, crows tend to be loosely colonial, so two or three pairs may nest close together in early spring.

Although fish crows are often found near water, they wander widely. They are very opportunistic, feeding by picking at roadkill, taking advantage of dead fish washed ashore, sampling late season berries, digging up snapping turtle eggs, or robbing bird feeders all with ease. But they are also predatory. Even though they are large birds, they can be quite stealthy. It is not uncommon for these birds to hunt large insects in open fields, or frogs and crayfish at the water’s edge. Unfortunately, fish crows are very adept nest robbers and take a good number of eggs and nestlings during the summer.

These birds, as well as their American cousins, can become problematic. They are very smart and readily learn where to find an easy meal. At bird feeders, they will quietly wait until the coast is clear, especially if savory mealworms or suet can be had, and polish off every scrap in no time. Southern farmers, years ago, found an effective deterrent: hanging one of these birds in effigy to keep flocks from decimating their crops. Recently I acquired a stuffed crow from my local bird store in hopes this method would work around my feeding station. I have also been concerned about both species of crow preying on nearby nests. Amazingly, it does work, though I do move it regularly to keep the attention of passing would-be marauders. And it’s quite the conversation starter as well!

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Big Blue

The majesty of great blue herons

By Susan Campbell

The great blue heron is a bird that will get anyone’s attention, bird lover or not. It is the largest of all the species found in the Sandhills and Piedmont and is second in wingspan only to the bald eagle. Also, the way it ever so slowly stalks its prey in the open is unique. Great blues are colonial nesters often gathering very close together in trees in wet environments where terrestrial predators are not a threat.

Great blues can be found across North Carolina year-round foraging in a variety of wet areas. However, nesting habitat can be harder to find. Many wet areas are too shallow to preclude raccoons, opossums and other climbing animals. Sizeable beaver ponds or islands in the middle of sizeable lakes with mature trees or large snags are attractive. And if a pair or two are successful in raising a brood high above the water, it is likely that the numbers of nests will grow in subsequent years to form a “heronry.” The female will weave a cup nest from the branches and then smaller, softer material (such as twigs, grasses, moss, etc.) that her mate delivers.

The bond between a pair of great blues is very strong during the breeding season. Male and female are both involved with rearing the nest generation. The large nest can accommodate up to five eggs. Both adults incubate and then brood the young. The male spends most of the daylight hours at the nest while the female is there overnight. Herons are very good parents, able to defend their young with not only their heavy, sharp bills but with very powerful wings.

It will take a year or more for the young to reach maturity. During the first several weeks they are fed mainly fish by their parents. As they begin to forage for themselves, they will become opportunistic, eating everything from large, aquatic invertebrates (such as crayfish) to frogs and even the eggs of other bird species. Some individuals will not breed until their third summer. Sexually mature birds will sport long plumes on their neck and back. They may be seen displaying to their mates by raising their crests and clapping bills together at or near the nest site.

The loud raspy croaking of herons is territorial and can be heard day or night at any time of the year. They will defend rich feeding areas as well as their nest from competitors. Great blues also call when in flight, perhaps to maintain contact with family members. In the air, these big birds have a very characteristic profile with slow, deep wingbeats, their necks coiled, and legs trailing out behind them.

These huge birds are amazingly unafraid of humans. Although they seldom tolerate a close approach, they are frequently found feeding from bulkheads, farm ponds and even small backyard water features. Many great blue herons have learned that people may provide an easy meal — even if it is in the form of fish remains or table scraps. So, keep an eye out; you may find one of these large birds closer than you think.

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Long Trek North

Louisiana waterthrush leads the way

By Susan Campbell

In early spring, birdwatchers such as myself are eager to spot the first returning migrants of the season. These are northbound birds that have spent the cooler months far to our south, in Central or South America. There, the living is easy, with plentiful food and a mild climate. But as the days begin to lengthen, these birds begin their return flight to the breeding grounds. Many may fly both day and night as the urgency of their mission increases. Hormone levels drive them to make their way swiftly to their natal area. Some return to the exact patch of woods, marsh or lake where they themselves hatched.

One of the earliest to return here in central North Carolina is the Louisiana waterthrush. A small, drab warbler, it is far more likely to be heard than seen at first. Its plumage is streaky brown and white. Birds can be recognized by their prominent broad white eyebrows and pink legs. As its name implies, the species prefers wet habitat, being at home along streams and rivers where it not only feeds in the trees, but along banks and around rocks at the water’s edge.

In the spring, Louisiana waterthrushes will call or sing as they move from place to place. As with so many species, the male’s vocalizing serves not only to attract a mate, but to establish territory. They have a loud, melodic song that carries well over the sound of moving water. The species’ call note, too, is a high volume “chip” that is easy to pick up in thick vegetation or above a gurgling stream.

Louisiana waterthrushes are insectivorous and so will consume any fly, midge or beetle that it sees. Also, waterthrushes will pick hatching aquatic insects such as mayflies or stoneflies out of the water. Individuals may wade in the shallows as they forage, making short jabs at potential prey items.

After pairs find one another and begin to raise the next generation of waterthrushes, they become virtually silent. This no doubt enables them to protect their nesting site and their young from would-be predators. Nests are built on or near the ground, making them relatively vulnerable to disturbance. Secretive behavior also reduces the chances that they will be parasitized by brown-headed cowbirds, which are known to seek out open cup nests such as those made by waterthrushes to deposit a single egg. The resulting nestling will be unwittingly cared for by waterthrush parents to the detriment of their own young.

Being one of the earliest warblers to return in the early spring, they are also likely to disperse in early summer after their young leave the nest. They may return to their Central American wintering grounds by the end of July. If you are fortunate enough to encounter a Louisiana waterthrush in the weeks to come, enjoy it because it is not likely to be around for very long.

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Heard But Not Seen

Eastern phoebes tuck their nests away

By Susan Campbell

Eastern phoebes are small black and white birds that can be easily overlooked — if it wasn’t for their loud voices. Repeated “fee-bee, fee-bee” calls can be heard around wet areas all over our state. The farther west one travels through the Piedmont and into the foothills of North Carolina, calling males become more and more evident. From March through June, males declare their territory from elevated perches adjacent to ponds and streams. Even on warm winter days, these little birds can be heard loudly chirping or even singing a phrase or two.

Phoebes have an extensive range in the U.S., from the East Coast to the Rockies, and up and across central Canada. In the winter they can be found in Southern states from the Carolinas over to Texas down into Mexico and northern Central America. They are exclusively insectivorous, feeding on beetles, dragonflies, moths — any bugs that will fit down the hatch. Although they do not typically take advantage of feeders, I have seen one that did manage to negotiate a suet cage one winter. Because their feet are weak, they’re not capable of clinging, so this bird actually perfected a hovering technique as it fed in spurts.

Originally eastern phoebes utilized ledges on cliff faces for nesting. We do not know much about their habits in such locations since few are found breeding in those places now. Things have changed a lot for these birds as humans have altered their landscape.

While phoebes can be easy to locate as a result of their loud calls, in our area their nests may not be. Although they are good-sized open cup structures, they will be tucked into out-of-the-way locations. Typically, they will be on a ledge high up on a girder under a bridge or associated with a culvert. They may also be up in the corner of a porch or other protected flat spot. Grasses and thin branches are woven and glued together with mud to form the nest; therefore it’s critical that the location be close to water.

The affinity eastern phoebes have for nesting on man-made structures in our area may indicate that these are safer than more traditional locations. Climbing snakes are not uncommon in the Sandhills. Black rat snakes and corn snakes are not as active on buildings as they are on bridges and other water control structures. The phoebes may be adapting their behavior in response to these predators and others less likely to be found so close to human activity.

If you have, or have had, phoebes on your property in summer, I’d like to hear about it. I continue to record locations and details on nesting substrate for the species in the Sandhills. The variety of locations that these little birds choose has been very curious. Light boxes and fixtures, gazebos, porch support posts and more have been used, if they are covered by at least a slight overhang. Not only is water a necessity for phoebes in summer, but they require mature trees for perching and foraging as well. Keep an ear out and perhaps you will find one of these adaptable birds nearby — and be sure to let me know!