Harpy, depicted as a bird with a female face.

Harpy

Harpy, depicted as a bird with a female face.

Hawks have strong talons, curved bills and keen eyesight.

Harrier

Hawks have strong talons, curved bills and keen eyesight.

Also known as the American harrier, the marsh hawk (<em>C. Hudsonius</em>) is nineteen to twenty-one inches long. It is of a pale gray color, the underside is white with small reddish spots.

American Marsh Hawk

Also known as the American harrier, the marsh hawk (C. Hudsonius) is nineteen to twenty-one…

An illustration of a chanting hawk.

Chanting Hawk

An illustration of a chanting hawk.

The Peregrine Falcon (Falco peregrinus), also known simply as the Peregrine, and historically as the "Duck Hawk" in North America, is a cosmopolitan bird of prey in the family Falconidae.

Duck Hawk

The Peregrine Falcon (Falco peregrinus), also known simply as the Peregrine, and historically as the…

An illustration of a fish hawk.

Fish hawk

An illustration of a fish hawk.

Birds of prey usually have stout, hooked beaks and sharp, curved claws, fitting them for clutching and tearing their prey.

Marsh Hawk

Birds of prey usually have stout, hooked beaks and sharp, curved claws, fitting them for clutching and…

An illustration of a marsh hawk.

Marsh hawk

An illustration of a marsh hawk.

Found in America, Mexico and the West Indies, this species averages nine to ten inches in length and subsists mostly on a diet of insects.

Night Hawk

Found in America, Mexico and the West Indies, this species averages nine to ten inches in length and…

An illustration of a pigeon hawk, also known as a Merlin.

Pigeon hawk

An illustration of a pigeon hawk, also known as a Merlin.

Hawks have strong talons, curved bills and keen eyesight.

Sparrow Hawk

Hawks have strong talons, curved bills and keen eyesight.

Several sparrow-hawks roosting on a branch.

Sparrowhawks

Several sparrow-hawks roosting on a branch.

"Accipiter nisus, the Sparrow-Hawk, which breeds throughout Europe, North Africa, Asia north of the Himalayas; extending further south in winter, but represented in South Africa. It is bluish-grey above, with white mottling on the nape and rufous cheeks, the white-tipped tail exhibiting from three to five bands, and the buffish-white under parts red-brown bars. A. H. Evans. This picture shows two adult Sparrow-hawk in a large flat nest of twigs with five young Sparrow-Hawk by a tall tree." A. H. Evans, 1900

Two Sparrow Hawk in a Large Flat Nest of Twigs with Five Young Sparrow-Hawk Beside a Tree Trunk

"Accipiter nisus, the Sparrow-Hawk, which breeds throughout Europe, North Africa, Asia north of the…

An illustration of a sparrow-hawk's skeleton.

Skeleton of a Sparrowhawk

An illustration of a sparrow-hawk's skeleton.

The skull of a nestling sparrowhawk, palatal view.

Sparrowhawk Skull

The skull of a nestling sparrowhawk, palatal view.

Head of a sparrow-hawk.

American Sparrowhawk

Head of a sparrow-hawk.

Resembles the American sparrow-hawk, feeding primarily on small birds and quadrupeds, as well as domesticated fowls.

European Sparrowhawk

Resembles the American sparrow-hawk, feeding primarily on small birds and quadrupeds, as well as domesticated…

The foot of an American sparrow-hawk.

Foot of American Sparrowhawk

The foot of an American sparrow-hawk.

In birds the muscles system is remarkable for their marked line of attachment to their tendons. Labels: 1, Occipito-Frontalis. 2, Orbicularis Palpaebrarum. 3, Temporal. 4, Masseter. 5, Sterno-cleido-Mastoid. 6, Trapezius. 7, Latissimus Dorsi. 8, Pectoralis. 9, Deltoid. 10, Biceps. 11, Triceps. 12, Gluteii. 13, Levator Caudae. 14, Rectus Femoris. 15, Gastrocnemius muscle.

The Superficial Muscles of a Hawk

In birds the muscles system is remarkable for their marked line of attachment to their tendons. Labels:…

Genus <em>Gypohierax</em>, is about the size of a goose, and is found in Western Africa, particularly Angola.

Vulture Hawk

Genus Gypohierax, is about the size of a goose, and is found in Western Africa, particularly…

An Egyptian hawkhead.

Hawkhead

An Egyptian hawkhead.

An illustration of a hen, a female chicken.

Hen

An illustration of a hen, a female chicken.

This image depicts a female spotted Java chicken.

Mottled Java Hen

This image depicts a female spotted Java chicken.

Prairie hens feed on grasshoppers, wheat, corn, seeds, and the buds of trees. They are also known as the pinnated grouse and the heath-hen.

Prairie Hens

Prairie hens feed on grasshoppers, wheat, corn, seeds, and the buds of trees. They are also known as…

Bird with wings spread, displayed on a shield.

Heraldry, Displayed

Bird with wings spread, displayed on a shield.

Depicts a bird in flight.

Heraldry, Volant

Depicts a bird in flight.

"Heron is the common name of birds of the genus Ardea. The herons are distinguished by having a long bill cleft beneath the eyes, a compressed body, long slender legs naked above the tarsal joint, three toes in front, the two outer united by a membrane, and by moderate wings. The tail is short, rounded, and composed of 10 or 12 feathers. The common heron is about three feet in length from the point of the bill to the end of the tail, builds its nest in high trees, many being sometimes on one tree. Its food consists of fish, frogs, mollusks, mice, moles, and similar small animals. It has an insatiable voracity, and digests its food with great rapidity. It haunts fresh water streams, marshes, ponds, and lakes, as also the seashore."&mdash;(Charles Leonard-Stuart, 1911)

Heron

"Heron is the common name of birds of the genus Ardea. The herons are distinguished by having a long…

A great blue heron, commonly found in tropical areas like Florida.  They belong to the order Grallatores, tribe Cultrirostres, and family Ardeida, which also includes spoonbills, storks, boatbills, night-herons, bitterns, adjutants, and ibises.

Heron

A great blue heron, commonly found in tropical areas like Florida. They belong to the order Grallatores,…

"The most typical forms of Ardea (Common Heron) are large slaty-coloured birds, varied by black, rufous, and white, the head being commonly darker and lower parts striped; while two slender occipital plumes are, in most cases, developed in the nuptial period, and the scapular and jugular feathers are elongated, though not decomposed." A. H. Evans, 1900

Common Heron

"The most typical forms of Ardea (Common Heron) are large slaty-coloured birds, varied by black, rufous,…

The European night heron draws its name from its nocturnal habits.

European Night Heron

The European night heron draws its name from its nocturnal habits.

Also known as the crested heron, the European gray heron ranges from Middle and Southern Europe into parts of Asia and Africa.

Gray Heron

Also known as the crested heron, the European gray heron ranges from Middle and Southern Europe into…

White, often with a yellowish tinge, the great white heron of America closely resembles its European cousin.

Great White Heron

White, often with a yellowish tinge, the great white heron of America closely resembles its European…

The grey heron (Ardea cinerea) is a large wading bird of the heron family.

Grey Heron

The grey heron (Ardea cinerea) is a large wading bird of the heron family.

"twenty-nine inches long; slate-gray above; dark maroon and slate-gray beneath ; found in the warmer parts of Europe, Asia, and Africa." &mdash; Goodrich, 1859

Purple Heron

"twenty-nine inches long; slate-gray above; dark maroon and slate-gray beneath ; found in the warmer…

"The Grey Heron in full flight. In the heron the wings are deeply concave, and unusually large as compared with the size of the bird."&mdash;Pettigrew, 1874

The Grey Heron

"The Grey Heron in full flight. In the heron the wings are deeply concave, and unusually large as compared…

Hesperornis is an extinct genus of flightless aquatic birds that lived during the Santonian to Campanian sub-epochs of the Late Cretaceous (89-65 mya). Hesperornis were very large birds, reaching up to 2 meters (6.5 feet) in length. They had virtually no wings, swimming with powerful hind legs. Their toes were probably lobed rather than being webbed, as in today's grebes; like in these, the toes could rotate well, which is necessary to decrease drag in lobed feet but not in webbed ones such as in loons, where the toes are simply folded together.

Hesperornis

Hesperornis is an extinct genus of flightless aquatic birds that lived during the Santonian to Campanian…

The hoopoes are easily recognized from the double range of plumes which form an arched crest on their head, which they can raise at pleasure.

Hoopoe

The hoopoes are easily recognized from the double range of plumes which form an arched crest on their…

Widely distributed over Africa, Asia, and Europe, the hoopoe has a distinctive crest of feathers on its head.

Hoopoe

Widely distributed over Africa, Asia, and Europe, the hoopoe has a distinctive crest of feathers on…

An old world bird that is distinguished by it's vibrant plumage and downward-curving bill, and bright crest.

Hoopoe

An old world bird that is distinguished by it's vibrant plumage and downward-curving bill, and bright…

The hoopoe (Upupa epops) is a colorful bird known for the crest upon its head.

Hoopoe

The hoopoe (Upupa epops) is a colorful bird known for the crest upon its head.

"Hornbills are a remarkable group of birds confined to Southern Asia and Africa, akin to the kingfishers and the toucans, remarkable for the very large size of the bill, and for an extraordinary horny protuberance by which it is surmounted, nearly as large as the bill itself, and of cellular structure within."&mdash;(Charles Leonard-Stuart, 1911)

Hornbill

"Hornbills are a remarkable group of birds confined to Southern Asia and Africa, akin to the kingfishers…

A concave hornbill perched on a branch, with mountains rising behind it.

Concave Hornbill

A concave hornbill perched on a branch, with mountains rising behind it.

The Screamers are inhabitants of South America. They live isolated, in pairs, and are mild and peaceful in their nature.

Horned Screamer (Palamedea Cornuta)

The Screamers are inhabitants of South America. They live isolated, in pairs, and are mild and peaceful…

The Wing-Banded Hornero (Furnarius figulus) is a bird in the Furnariidae family of ovenbirds.

Wing-Banded Hornero

The Wing-Banded Hornero (Furnarius figulus) is a bird in the Furnariidae family of ovenbirds.

This illustration shows a human leg (front view), and comparative diagrams showing modifications of the leg:
1. Human, 2. Ox, 3. Horse, 4. Bird, 5. Frog, 6. Crocodile, 7. Seal, 8. Dog, 9. Bear
P. Pelvis, FE. Femur, TI. Tibia, FI. Fibula, TA. Tarsus, MT. Metatarsus, PH. Phalanges, OC. Os Calcis.

Human Leg (Front View), and Comparative Diagrams showing Modifications of the Leg

This illustration shows a human leg (front view), and comparative diagrams showing modifications of…

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

Hummingbird

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

Hummingbird

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

Bar-Tailed Hummingbird

The nest of the hummingbird is a masterpiece. It is about half the size of an apricot.

The Coppery-Bellied Puffleg (Eriocnemis cupreoventris) is a hummingbird in the Trochilidae family.

Coppery-Bellied Puffleg

The Coppery-Bellied Puffleg (Eriocnemis cupreoventris) is a hummingbird in the Trochilidae family.

A species of hummingbird, the Red-Tailed Comet (Sappho sparganura) is native to South America.

Red-Tailed Comet

A species of hummingbird, the Red-Tailed Comet (Sappho sparganura) is native to South America.

The ruby-throated hummingbird (Archilochus colubris) is a bird with a long beak and rapid wings. This species is known for the red color upon its neck.

Ruby-Throated Hummingbird

The ruby-throated hummingbird (Archilochus colubris) is a bird with a long beak and rapid wings. This…

The Peruvian Sheartail (Thaumastura cora) is a hummingbird in the Trochilidae family of hummingbirds.

Peruvian Sheartail

The Peruvian Sheartail (Thaumastura cora) is a hummingbird in the Trochilidae family of hummingbirds.

The White-Tipped Sicklebill (Eutoxeres aquila) is a bird in the Trochilidae family of hummingbirds.

White-Tipped Sicklebill Hummingbird

The White-Tipped Sicklebill (Eutoxeres aquila) is a bird in the Trochilidae family of hummingbirds.

The supercolious hummingbird, noted for it's unusually large nest. It is native to Brazil.

Supercolious Hummingbird

The supercolious hummingbird, noted for it's unusually large nest. It is native to Brazil.

A pair of topaz hummingbirds, with their nest and eggs.

Topaz Hummingbird

A pair of topaz hummingbirds, with their nest and eggs.

A picture depicting a multitude of hummingbirds.

Hummingbirds

A picture depicting a multitude of hummingbirds.

A trio of hummingbirds resting on a branch, one of which is in a nest.

Hummingbirds

A trio of hummingbirds resting on a branch, one of which is in a nest.

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from flowers.

Hummingbirds

A group of humming birds with particularly long and narrow beaks, well-adapted for sipping nectar from…

A group of humming birds, two of which are vying for a flower's nectar.

Hummingbirds

A group of humming birds, two of which are vying for a flower's nectar.

Four humming birds, two of which are resting on a branch, while the other two cavort in the air above.

Hummingbirds

Four humming birds, two of which are resting on a branch, while the other two cavort in the air above.