Saturday, November 30, 2013

Pied-billed Grebe


A small diving bird with a chicken-like bill, the Pied-billed Grebe is common on lakes and ponds across North America. It is rarely seen flying and prefers to sink out of sight when danger threatens.

Although it swims like a duck, the Pied-billed Grebe does not have webbed feet. Instead of having a webbing connecting all the toes, each toe has lobes extending out on the sides that provide extra surface area for paddling.

Pied-billed Grebe Range Map

Chinese Goose



The Chinese Goose is a breed of domesticated goose descended from the wild swan goose. Chinese geese differ from the wild birds in much larger size (up to 5–10 kg in males, 4–9 kg in females), and in having an often strongly developed basal knob on the upper side of the bill. The knob at the top of the beak is more prominent on males than females.

Yellow-rumped Warbler.


Yellow-rumped Warblers are impressive in the sheer numbers with which they flood the continent each fall. Shrubs and trees fill with the streaky brown-and-yellow birds and their distinctive, sharp chips. Though the color palette is subdued all winter, you owe it to yourself to seek these birds out on their spring migration or on their breeding grounds. Spring molt brings a transformation, leaving them a dazzling mix of bright yellow, charcoal gray and black, and bold white.

The Yellow-rumped Warbler is the only warbler able to digest the waxes found in bayberries and wax myrtles. Its ability to use these fruits allows it to winter farther north than other warblers, sometimes as far north as Newfoundland.

Yellow-rumped Warbler Range Map

Monday, November 25, 2013

Common Loon


The eerie calls of Common Loons echo across clear lakes of the northern wilderness. Summer adults are regally patterned in black and white. In winter, they are plain gray above and white below, and you’ll find them close to shore on most seacoasts and a good many inland reservoirs and lakes. Common Loons are powerful, agile divers that catch small fish in fast underwater chases. They are less suited to land, and typically come ashore only to nest.

The Common Loon swims underwater to catch fish, propelling itself with its feet. It swallows most of its prey underwater. The loon has sharp, rearward-pointing projections on the roof of its mouth and tongue that help it keep a firm hold on slippery fish. Loons are agile swimmers, but they move pretty fast in the air, too. Migrating loons have been clocked flying at speeds more than 70 mph. A hungry loon family can put away a lot of fish. Biologists estimate that loon parents and their 2 chicks can eat about a half-ton of fish over a 15-week period. Loons are well equipped for their submarine maneuvers to catch fish. Unlike most birds, loons have solid bones that make them less buoyant and better at diving. They can quickly blow air out of their lungs and flatten their feathers to expel air within their plumage, so they can dive quickly and swim fast underwater. Once below the surface, the loon’s heart slows down to conserve oxygen.

Common Loon Range Map

Hooded Merganser


This beauty was witnessed along the coast of the Cooper river in a brisk early morning a few days before Thanksgiving. “Hooded” is something of an understatement for this extravagantly crested little duck. Adult males are a sight to behold, with sharp black-and-white patterns set off by chestnut flanks. Females get their own distinctive elegance from their cinnamon crest. Hooded Mergansers are fairly common on small ponds and rivers, where they dive for fish, crayfish, and other food, seizing it in their thin, serrated bills.

Along with Wood Ducks and other cavity-nesting ducks, Hooded Mergansers often lay their eggs in other females’ nests. This is called “brood parasitism” and is similar to the practice of Brown-headed Cowbirds, except that the ducks only lay eggs in nests of their own species. Female Hooded Mergansers can lay up to about 13 eggs in a clutch, but nests have been found with up to 44 eggs in them. Hooded Mergansers find their prey underwater by sight. They can actually change the refractive properties of their eyes to improve their underwater vision. In addition, they have an extra eyelid, called a “nictitating membrane,” which is transparent and helps protect the eye during swimming, like a pair of goggles. Hooded Merganser ducklings leave their nest cavity within 24 hours of hatching. First, their mother checks the area around the nest and calls to the nestlings from ground level. From inside the nest, the little fluffballs scramble up to the entrance hole and then flutter to the ground, which may be 50 feet or more below them. In some cases they have to walk half a mile or more with their mother to the nearest body of water.

Hooded Merganser Range Map

Sunday, November 10, 2013

American Wigeon


A common and increasingly abundant duck, the American Wigeon breeds in northwestern North America and is found throughout the rest of the continent in migration and in winter. Its small bill and the male's white forehead, as well as certain aspects of nesting and feeding behavior, distinguish this species from other dabbling ducks.

The American Wigeon was formerly known as "Baldpate" because the white stripe resembled a bald man's head. The American Wigeon is a rare, but regular straggler to Europe where it turns up in flocks of Eurasian Wigeon. The American Wigeon's short bill enables it to exert more force at the bill tip than other dabbling ducks, thus permitting efficient dislodging and plucking of vegetation.
American Wigeon Range Map

Eastern Meadowlark


The sweet, lazy whistles of Eastern Meadowlarks waft over summer grasslands and farms in eastern North America. The birds themselves sing from fenceposts and telephone lines or stalk through the grasses, probing the ground for insects with their long, sharp bills. On the ground, their brown-and-black dappled upperparts camouflage the birds among dirt clods and dry grasses. But up on perches, they reveal bright-yellow underparts and a striking black chevron across the chest.

A male Eastern Meadowlark typically has two mates at a time, rarely three. Where Eastern and Western meadowlark ranges overlap in the central U.S., the two species refuse to share territories. Their songs sound totally different to each other, like a foreign language, so singing doesn’t always do the job of communicating territorial boundaries. Instead, the two species are likely to fight for territorial supremacy.
Eastern Meadowlark Range Map

Saturday, November 9, 2013

Golden-crowned Kinglet


Golden-crowned Kinglets are boldly marked with a black eyebrow stripe and flashy lemon-yellow crest. A good look can require some patience, as they spend much of their time high up in dense spruce or fir foliage. To find them, listen for their high, thin call notes and song. Though barely larger than a hummingbird, this frenetically active bird can survive –40 degree nights, sometimes huddling together for warmth. They breed in the far north and montane west and visit most of North America during winter.

The Golden-crowned Kinglet usually raises two large broods of young, despite the short nesting season of the northern boreal forest. The female feeds her first brood only up until the day after they leave the nest. She then starts laying the second set of eggs while the male takes care of the first brood. The male manages to feed eight or nine nestlings himself, and he occasionally feeds the incubating female too. Each of the Golden-crowned Kinglet's nostrils is covered by a single, tiny feather.

Golden-crowned Kinglet Range Map

Wednesday, November 6, 2013

Yellow-bellied Sapsucker


On a walk through the forest you might spot rows of shallow holes in tree bark. In the East, this is the work of the Yellow-bellied Sapsucker, an enterprising woodpecker that laps up the leaking sap and any trapped insects with its specialized, brush-tipped tongue. Attired sharply in barred black-and-white, with a red cap and (in males) throat, they sit still on tree trunks for long intervals while feeding. To find one, listen for their loud mewing calls or stuttered drumming.

The Yellow-bellied Sapsucker makes two kinds of holes in trees to harvest sap. Round holes extend deep in the tree and are not enlarged. The sapsucker inserts its bill into the hole to probe for sap. Rectangular holes are shallower, and must be maintained continually for the sap to flow. The sapsucker licks the sap from these holes, and eats the cambium of the tree too. New holes usually are made in a line with old holes, or in a new line above the old. The sapwells made by Yellow-bellied Sapsuckers attract hummingbirds, which also feed off the sap flowing from the tree. In some parts of Canada, Ruby-throated Hummingbirds rely so much on sapwells that they time their spring migration with the arrival of sapsuckers. Other birds as well as bats and porcupines also visit sapsucker sapwells. Yellow-bellied Sapsuckers have been found drilling sapwells in more than 1,000 species of trees and woody plants, though they have a strong preference for birches and maples. The Yellow-bellied Sapsucker is the only woodpecker in eastern North America that is completely migratory. Although a few individuals remain throughout much of the winter in the southern part of the breeding range, most head farther south, going as far south as Panama. Females tend to migrate farther south than do males.
Yellow-bellied Sapsucker Range Map

Sunday, November 3, 2013

Bald Eagle


The Bald Eagle has been the national emblem of the United States since 1782 and a spiritual symbol for native people for far longer than that. These regal birds aren’t really bald, but their white-feathered heads gleam in contrast to their chocolate-brown body and wings. Look for them soaring in solitude, chasing other birds for their food, or gathering by the hundreds in winter. Once endangered by hunting and pesticides, Bald Eagles have flourished under protection.

Rather than do their own fishing, Bald Eagles often go after other creatures’ catches. A Bald Eagle will harass a hunting Osprey until the smaller raptor drops its prey in midair, where the eagle swoops it up. A Bald Eagle may even snatch a fish directly out of an Osprey’s talons. Fishing mammals (even people sometimes) can also lose prey to Bald Eagle piracy. Had Benjamin Franklin prevailed, the U.S. emblem might have been the Wild Turkey. In 1784, Franklin disparaged the national bird’s thieving tendencies and its vulnerability to harassment by small birds. "For my own part,” he wrote, “I wish the Bald Eagle had not been chosen the Representative of our Country. He is a Bird of bad moral Character. He does not get his Living honestly. … Besides he is a rank Coward: The little King Bird not bigger than a Sparrow attacks him boldly and drives him out of the District.” Sometimes even the national bird has to cut loose. Bald Eagles have been known to play with plastic bottles and other objects pressed into service as toys. One observer witnessed six Bald Eagles passing sticks to each other in midair. The largest Bald Eagle nest on record, in St. Petersburg, Florida, was 2.9 meters in diameter and 6.1 meters tall. Another famous nest—in Vermilion, Ohio—was shaped like a wine glass and weighed almost two metric tons. It was used for 34 years until the tree blew down.
Bald Eagle Range Map

Sharp-shinned Hawk


A tiny hawk that appears in a blur of motion—and often disappears in a flurry of feathers. That’s the Sharp-shinned Hawk, the smallest hawk in North America and a daring, acrobatic flier. These raptors have distinctive proportions: long legs, short wings, and very long tails, which they use for navigating their deep-woods homes at top speed in pursuit of songbirds and mice. They’re easiest to spot in fall on their southward migration, or occasionally at winter feeders.

Sharp-shinned Hawks migrate south out of Canada in the fall and are observed at hawk watches in very large numbers. The hawks follow similar landscape features and often are concentrated in certain areas. More than 11,000 Sharp-shinned Hawks were seen on one October day at Cape May Point, New Jersey. Female Sharp-shinned Hawks are about a third bigger and heavier than males. This is a typical pattern for many hawks and owls, but otherwise rare in the bird world. Sharp-shinned Hawks carry their prey to a stump or low branch to pluck it before eating. Swallowing feathers is not normal for them, as it is for owls.
Sharp-shinned Hawk Range Map

American Kestrel


North America’s littlest falcon, the American Kestrel packs a predator’s fierce intensity into its small body. It's one of the most colorful of all raptors: the male’s slate-blue head and wings contrast elegantly with his rusty-red back and tail; the female has the same warm reddish on her wings, back, and tail. Hunting for insects and other small prey in open territory, kestrels perch on wires or poles, or hover facing into the wind, flapping and adjusting their long tails to stay in place. Kestrels are declining in parts of their range; you can help them by putting up nest boxes.

Sports fans in some cities get an extra show during night games: kestrels perching on light standards or foul poles, tracking moths and other insects in the powerful stadium light beams and catching these snacks on the wing. Some of their hunting flights have even made it onto TV sports coverage. When nature calls, nestling kestrels back up, raise their tails, and squirt feces onto the walls of the nest cavity. The feces dry on the cavity walls and stay off the nestlings. The nest gets to be a smelly place, with feces on the walls and uneaten parts of small animals on the floor. It can be tough being one of the smallest birds of prey. Despite their fierce lifestyle, American Kestrels end up as prey for larger birds such as Northern Goshawks, Red-tailed Hawks, Barn Owls, American Crows, and Sharp-shinned and Cooper’s Hawks, as well as rat snakes, corn snakes, and even fire ants. Unlike humans, birds can see ultraviolet light. This enables kestrels to make out the trails of urine that voles, a common prey mammal, leave as they run along the ground. Like neon diner signs, these bright paths may highlight the way to a meal—as has been observed in the Eurasian Kestrel, a close relative.
American Kestrel Range Map

American Avocet


With its elegant profile and striking coloration, the American Avocet is unique among North American birds. In summer it can be found in temporary and unpredictable wetlands across western North America where it swings its long upturned bill through the shallow water to catch small invertebrates.

In response to predators, the American Avocet sometimes issues a series of call notes that gradually changes pitch, simulating the Doppler effect and thus making its approach seem faster than it actually is. Nesting American Avocets aggressively attack predators, sometimes physically striking Northern Harriers or Common Ravens. American Avocet chicks leave the nest within 24 hours after hatching. Day-old avocets can walk, swim, and even dive to escape predators.
American Avocet Range Map

Black-bellied Plover


A large shorebird of coastal beaches, the Black-bellied Plover is striking in its black-and-white breeding plumage. It is the largest plover in North America and can be found along the coasts in winter northward to Massachusetts and British Columbia.

Wary and quick to give alarm calls, the Black-bellied Plover functions worldwide as a sentinel for mixed groups of shorebirds. These qualities allowed it to resist market hunters, and it remained common when populations of other species of similar size were devastated. The Black-bellied Plover may be more sensitive to disturbance than many other birds because it is especially wary, flushing from the nest or feeding and roosing sites when potential predators are still far away. Nevertheless, no evidence exists for desertion of the nest or roost sites because of disturbance. The Black-bellied Plover is the only American plover that has a hind toe on its foot. The hind toe, however, is so small that it is difficult to see in the field.

Black-bellied Plover Range Map

American White Pelican


Breeding on lakes throughout the northern Great Plains and mountain West, the American White Pelican is one of the largest birds in North America. It winters along the coasts, but breeds only inland.

The White Pelican does not dive for fish as the Brown Pelican does. Instead, it dips its head underwater to scoop up fish. Several pelicans may fish cooperatively, moving into a circle to concentrate fish, and then dipping their heads under simultaneously to catch fish.
American White Pelican Range Map

Roseate Spoonbill


A bizarre wading bird of the southern coasts, the Roseate Spoonbill uses its odd bill to strain small food items out of the water. Its bright pink coloring leads many Florida tourists to think they have seen a flamingo.
Roseate Spoonbill Range Map

Anhinga


A bird of southern swamps, the Anhinga is known as the Water-Turkey for its swimming habits and broad tail, and also as the Snake-Bird for its habit of swimming with just its long head and neck sticking out of the water.

The Anhinga is frequently seen soaring high in the sky overhead. It is a graceful flier and can travel long distances without flapping its wings, much in the manner of a Turkey Vulture.
Anhinga Range Map

Saturday, November 2, 2013

Lesser Yellowlegs


The Lesser Yellowlegs is a slender, long-legged shorebird that readily shows off the brightly colored legs that give it its name. It is an active feeder, often running through the shallow water to chase its prey.

Both the male and female Lesser Yellowlegs provide parental care to the young, but the female tends to leave the breeding area before the chicks can fly, thus leaving the male to defend the young until fledging.

Lesser Yellowlegs Range Map

Least Sandpiper


Least Sandpipers are the smallest of the small sandpipers known as “peeps”—not much bigger than a sparrow. They have distinctive yellow-green legs and a high-pitched creep call. Look for them on edges of mudflats or marshes, where they walk with a hunched posture and probe for little crustaceans, insects, and other invertebrates. This common but declining shorebird migrates thousands of miles between its arctic breeding grounds and wintering grounds as far south as Chile and Brazil.

The Least Sandpiper is the smallest shorebird in the world, weighing in at about 1 ounce and measuring 5-6 inches long. Males are slightly smaller than females. Eastern populations probably fly nonstop over the ocean from the Gulf of St. Lawrence and New England to wintering grounds in northeastern South America, a distance of about 1,800 to 2,500 miles.

Least Sandpiper Range Map

Mottled Duck


The only duck adapted to breeding in southern marshes, the Mottled Duck is a dull relative of the Mallard. It is in danger of being displaced by introduced Mallards, primarily because of hybridization.

Mottled Duck Range Map

Cooper's Hawk


Among the bird world’s most skillful fliers, Cooper’s Hawks are common woodland hawks that tear through cluttered tree canopies in high speed pursuit of other birds. You’re most likely to see one prowling above a forest edge or field using just a few stiff wingbeats followed by a glide. With their smaller lookalike, the Sharp-shinned Hawk, Cooper’s Hawks make for famously tricky identifications.

Dashing through vegetation to catch birds is a dangerous lifestyle. In a study of more than 300 Cooper’s Hawk skeletons, 23 percent showed old, healed-over fractures in the bones of the chest, especially of the furcula, or wishbone. A Cooper's Hawk captures a bird with its feet and kills it by repeated squeezing. Falcons tend to kill their prey by biting it, but Cooper’s Hawks hold their catch away from the body until it dies. They’ve even been known to drown their prey, holding a bird underwater until it stopped moving.

Cooper

American Coot


The waterborne American Coot is one good reminder that not everything that floats is a duck. A close look at a coot—that small head, those scrawny legs—reveals a different kind of bird entirely. Their dark bodies and white faces are common sights in nearly any open water across the continent, and they often mix with ducks. But they’re closer relatives of the gangly Sandhill Crane and the nearly invisible rails than of Mallards or teal.

Although it swims like a duck, the American Coot does not have webbed feet like a duck. Instead, each one of the coot’s long toes has broad lobes of skin that help it kick through the water. The broad lobes fold back each time the bird lifts its foot, so it doesn’t impede walking on dry land, though it supports the bird’s weight on mucky ground.

American Coot Range Map

Northern Shoveler


Perhaps the most outwardly distinctive of the dabbling ducks, the Northern Shoveler inhabits wetlands across much of North America. Its elongated, spoon-shaped bill has comblike projections along its edges, which filter out food from the water.

The bill of the Northern Shoveler is about 6.5 cm (2.5 inches) long. The bill has has about 110 fine projections (called lamellae) along the edges, for straining food from water. Northern Shoveler pairs are monogamous, and remain together longer than pairs of other dabbling duck species. When flushed off the nest, a female Northern Shoveler often defecates on its eggs, apparently to deter predators.

Northern Shoveler Range Map

Black-necked Stilt


A striking black-and-white bird with very long, thin red legs, the Black-necked Stilt is found along the edges of shallow water in open country.

Five species of rather similar-looking stilts are recognized in the genus Himantopus. They have the second-longest legs in proportion to their bodies of any bird, exceeded only by flamingos.

Black-necked Stilt Range Map

Little Blue Heron


A smallish heron of the southeastern United States, the Little Blue Heron breeds in various freshwater and estuarine habitats. It is the only heron species in which first-year birds and adults show dramatically different coloration: first-year birds are pure white, while adults are blue.

The Snowy Egret tolerates the close proximity of white Little Blue Herons more than that of dark Little Blue Herons. A white Little Blue Heron catches more fish in the company of Snowy Egrets than when alone. This relationship may be one reason why young Little Blue Herons stay white for a year. Another advantage of white plumage is that young Little Blue Herons are more readily able to integrate into mixed-species flocks of white herons, thus gaining a measure of protection against predators.

Little Blue Heron Range Map

Glossy Ibis


A dark wading bird with a long, down-curved bill. Although the Glossy Ibis in North America lives primarily along the Atlantic Coast, it also can be found in Europe, Africa, Asia, and Australia.

Glossy Ibis Range Map