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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.
Beautiful peacock. - Birds. A beautiful colorful peacock.
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Beautiful peacock.

Added 4 days ago by Grażyna

19 1

Pelican in trouble. - Pelican in trouble. No fishing!
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Pelican in trouble.

Added 5 days ago by Zeta

26

Morning alarm clock. - Morning alarm clock on the fence.
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Morning alarm clock.

Added 6 days ago by Zeta

188

Nice guy - Dove on the windowsill
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Nice guy

Added 8 days ago by Maria 47

8

Orange parrots - beautiful orange parrots
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Orange parrots

Added 12 days ago by #Zakreconax3

55 1

budgies - beautiful breeding parrots
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budgies

Added 12 days ago by #Zakreconax3

31

Sparrow while hunting - A sparrow located in its natural environment of the North Pole.
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Sparrow while hunting

Added 2 weeks ago by Ann

18 1

lovely animals - a house with wings of cocks for a dog
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lovely animals

Added 2 weeks ago by Basiunia

53

Swans - Dubiecko, swans on the pond
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Swans

Added 3 weeks ago by Mila

78

Beautiful peacock - peacock peacock is actually peacock
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Beautiful peacock

Added 3 weeks ago by Ann

14

Parrots - Love in every species, in every life
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Parrots

Added 4 weeks ago by Zole

44

extremely - What is this fairy tale? does anyone know
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extremely

Added 4 weeks ago by stachna

12

lovely animals - purple no - disconnectors
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lovely animals

Added month ago by Basiunia

90 1

Colorful puzzle - colorful jigsaw puzzle
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Colorful puzzle

Added month ago by andi

20

White stork - during the annual inventory of nests in one of the communes in central Poland from the "owners&
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White stork

Added month ago by Matyszczk

20

White stork - These birds return to Poland more or less in March or April. Why were so many children born at the b
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White stork

Added month ago by Matyszczk

14

Dear pets - colorful jigsaw puzzle
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Dear pets

Added month ago by andi

38 1

Sunflowers - colorful jigsaw puzzle
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Sunflowers

Added 2 months ago by andi

116

Painting. - Art. Painting. Birds.
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Painting.

Added 2 months ago by Grażyna

58

A family of penguins - The penguin family is a fascinating phenomenon in the Antarctic
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A family of penguins

Added 2 months ago by kajtek

38

lovely animals - geese in the shower
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lovely animals

Added 2 months ago by Basiunia

34

Landscape-painting - colorful jigsaw puzzle
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Landscape-painting

Added 2 months ago by andi

234 1

White heron. - White heron in the Danube delta.
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White heron.

Added 2 months ago by Zeta

34

Goose flowing goose. - Goose swimming geese on the lake.
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Goose flowing goose.

Added 2 months ago by Zeta

17

Ducks on the pond. - Ducks on the pond at the house.
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Ducks on the pond.

Added 2 months ago by Zeta

195

Animals. - Forest life of animals and birds.  The best puzzle zone wit animals.
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Animals.

Added 2 months ago by Grażyna

23

Menacing birds. - A flock of dangerous birds on the tree.
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Menacing birds.

Added 2 months ago by Grażyna

29

penguins - the beauty of penguins
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penguins

Added 2 months ago by MF8

36

Swans. - Two swans: white and black.
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Swans.

Added 2 months ago by Grażyna

68

lovely animals - floating duck
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lovely animals

Added 2 months ago by Basiunia

156 1

Budgerigars parrots - colorful jigsaw puzzle
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Budgerigars parrots

Added 2 months ago by andi

37

Flamingos - colorful jigsaw puzzle
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Flamingos

Added 2 months ago by andi

43 1

The black Swan. - A beautiful black swan.
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The black Swan.

Added 3 months ago by Zeta

305 1

Inflatable duck - Duck mattress for children
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Inflatable duck

Added 3 months ago by Domi

29

Woodpecker on the tree - This is a photo of a woodpecker on a tree
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Woodpecker on the tree

Added 3 months ago by Ololo

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