bird

Birds (Aves) are a group of endothermic vertebrates, characterised by feathers, toothless beaked jaws, the laying of hard-shelled eggs, a high metabolic rate, a four-chambered heart, and a strong yet lightweight skeleton. Birds live worldwide and range in size from the 5 cm (2 in) bee hummingbird to the 2.75 m (9 ft) ostrich. They rank as the world’s most numerically-successful class of tetrapods, with approximately ten thousand living species, more than half of these being passerines, sometimes known as perching birds. Birds have wings which are more or less developed depending on the species; the only known groups without wings are the extinct moa and elephant birds. Wings, which evolved from forelimbs, gave birds the ability to fly, although further evolution has led to the loss of flight in flightless birds, including ratites, penguins, and diverse endemic island species of birds. The digestive and respiratory systems of birds are also uniquely adapted for flight. Some bird species of aquatic environments, particularly seabirds and some waterbirds, have further evolved for swimming. Reverse genetic engineering and the fossil record both demonstrate that birds are modern feathered dinosaurs, having evolved from earlier feathered dinosaurs within the theropod group, which are traditionally placed within the saurischian dinosaurs. The closest living relatives of birds are the crocodilians. Primitive bird-like dinosaurs that lie outside class Aves proper, in the broader group Avialae, have been found dating back to the mid-Jurassic period, around 170 million years ago.
Colorful parrots. - Paradise birds in the garden.
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Colorful parrots.

Added yesterday by Grażyna

18

Flamingos. - Beautiful flamingos on the beach.
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Flamingos.

Added 4 days ago by Grażyna

21

Swan.. - Lady swan on the pond.
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Swan..

Added 5 days ago by Grażyna

51

Geese at the pond. - A flock of geese at the pond ...
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Geese at the pond.

Added 6 days ago by Grażyna

40

Black bird - Black bird on a branch
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Black bird

Added 6 days ago by Michalina

5

Sparrows in the park. - Sparrows on a bush in the park.
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Sparrows in the park.

Added 8 days ago by Zeta

55

Toucan. Costa Rica. - Toucan on the tree. Costa Rica.
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Toucan. Costa Rica.

Added 10 days ago by Zeta

29

Flamingos. - Flamingos wading in the ocean.
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Flamingos.

Added 11 days ago by Zeta

39

BAJKOWY VIEW - Leave, rest, relax
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BAJKOWY VIEW

Added 2 weeks ago by ada

110

Penguins !!! - Penguins !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Penguins !!!

Added 2 weeks ago by Marcin

6

JACEK'S DUCK - FOR CHILDREN DUCK OF A WYBIEG
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JACEK'S DUCK

Added 3 weeks ago by MANIEK

106

animals c.d - parrot among flowers
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animals c.d

Added 3 weeks ago by stachna

39

singing birds - colorful hummingbird, red flowers
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singing birds

Added 3 weeks ago by stachna

30

animals c.d - parrot is eating flowers
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animals c.d

Added 3 weeks ago by stachna

63

animals c.d - A woodpecker eats a sunflower
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animals c.d

Added 3 weeks ago by stachna

13

singing birds - a colorful bird on a peg
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singing birds

Added 3 weeks ago by stachna

39

animals c.d - handsome rooster on the fence
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animals c.d

Added 3 weeks ago by stachna

48

lovely animals - sleeping cat and kitten
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lovely animals

Added 3 weeks ago by Basiunia

41

Pink pelicans. - Pink pelicans on the water.
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Pink pelicans.

Added 3 weeks ago by Zeta

130

Gray heron. - Gray heron by the lake.
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Gray heron.

Added 3 weeks ago by Zeta

28

two white-haired Swans - two white-haired Swans
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two white-haired Swans

Added 3 weeks ago by Joasia

90

colorful two tulips - colorful two tulips
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colorful two tulips

Added 3 weeks ago by Joasia

75

clock and cock - the clock shows the time of drinking
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clock and cock

Added 4 weeks ago by Basiunia

22

sparrow on a willow - spring landscape, sparrow on willow
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sparrow on a willow

Added 4 weeks ago by sandra

179 1

Summer stork - Return of the stork to his home
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Summer stork

Added month ago by Jarek

205

povestea gastelor - Gascanul din ilustratiile him Vasile Olac
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povestea gastelor

Added month ago by LML

20

A late nightingale - for a Polish language lesson puzzle
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A late nightingale

Added month ago by Monika

74

Colorful puzzle - colorful jigsaw puzzle
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Colorful puzzle

Added month ago by andi

19

Beach at dusk. - Beach at dusk. Folded umbrellas.
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Beach at dusk.

Added month ago by Zeta

27

Chicken chicken - Chicken chicken farm
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Chicken chicken

Added month ago by Chicken

38

housing butterflies - there was a rally of butterflies on this bush
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housing butterflies

Added month ago by ela

32

lovely animals - I'm sitting in a tree
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lovely animals

Added month ago by Basiunia

57

Tabaluga - fairy tale for children, very liked
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Tabaluga

Added month ago by #Zakreconax3

54

BIRD BODY PARTS - THE PARTS OF THE BODY: BECCO, ZAMPE, ALI, CORPO
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BIRD BODY PARTS

Added month ago by CATE

189

lovely animals - white dove and rubella
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lovely animals

Added 2 months ago by Basiunia

44

Sweet puzzle - Find and find out what the animal is in this mess.
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Sweet puzzle

Added 2 months ago by Wiola

129