A male cardinal

A male cardinal sits on a squirrel feeder hanging from the side of a tree in Moreland Hills.

Two Dalmatian Pelicans

Two Dalmatian Pelicans, seen, in the outdoor enclosure, at Schoenbrunn zoo, in Vienna.

Striped owls

A group of striped owls sit at the Animal Hospital at the Niteroi Zoo, Brazil.

Flamingo

A greater flamingo chick ( Phoenicopterus roseus )

A greater flamingo chick, Phoenicopterus roseus, is propelled by its mother in their enclosure in the Budapest Zoo in Budapest.

A Snowy Owl

A hummingbird

A hummingbird hovers over a patch of flowers as it collects nectar.

Bar-headed goose

A bar-headed goose walks with one of her day old her chicks at the zoo of Servion near Lausanne, Switzerland.

African Crown Crane

An African Crown Crane is seen at the Olemse zoo in Olmen .

A Green Peafowl

A Green Peafowl is pictured at the Dubai Zoo.

Adult male cuckoo

An adult male cuckoo perched on post in spring.The distinctive cry of the cuckoo, which signifies the arrival of spring, is set to become something of a rarity after the grey-blue songbird was added to the Red List of endangered birds.

Red and blue-gold macaw

A red macaw battles a blue-and-gold macaw for food at the Dusit Zoo in Bangkok, Thailand. The colorful birds are a popular attraction at the zoo.

A white peacock

A white peacock flares out its plumage at the Giza zoo in Cairo. White peacocks are often mistaken for albinos but are in fact a color variation of the Indian Blue peacock, and are considered rare.

Parrots

Parrots are seen at a zoo in Nanjing, Jiangsu province.

A peacock

A peacock, not part of any zoo exhibit, displays his feathers while roaming the grounds of the Honolulu Zoo.

A young male snowy owl

This picture shows a young male snowy owl on Jones Beach in Wantagh, N.Y. on Long Island. Biologists say an increase in snowy owl sightings across northern states suggests that the arctic species is doing so well on its northern breeding ground that competition is driving the young ones south.

A tame golden eagle chases a hare

A tame golden eagle chases a hare during a traditional hunting contest in central Kazakhstan. Kazakhstan's national sport of Sayat - or hunting with golden eagles - is popular in the Central Asian state. Berkutchi, or golden eagle hunters, from all over the country arrived for the annual competition. This hare escaped from eagle.

Chicks

Two Rainbow Lorikeet

Two Rainbow Lorikeet birds fight with each other in their avery during a photocall at Edinburgh zoo's annual stocktake in Edinburgh.

Archaeopteryx, the first known bird

Archaeopteryx, the first known bird, had a hearing range similar to the modern-day emu's (pictured), according to a new study that boosts the avian claims of this descendant of the dinosaurs.

About the size and shape of a European magpie, Archaeopteryx lithographica appeared on the scene around 150 million years ago, in the Jurassic era.