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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.
Flamingos. - Beautiful flamingos birds.
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Flamingos.

Added month ago by Grażyna

61

REKSIO I KURY ON THE ROOF - Reksio with hens in the yard greets the hens
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REKSIO I KURY ON THE ROOF

Added 4 months ago by Basia

135

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

Added year ago by Jarek

225

Tabaluga - fairy tale for children, very liked
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Tabaluga

Added year ago by #Zakreconax3

96

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

Added year ago by CATE

220 1

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

Added year ago by Wiola

149

Stork on the meadow - The stork is a symbol of spring
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Stork on the meadow

Added year ago by Ania

98

lapwing bird - lapwing is a wise bird is small and beautiful
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lapwing bird

Added year ago by Sandra

20

White pigeon - White dove in the blue sky
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White pigeon

Added year ago by Katqu

51

SWAN - beautiful bird with unbelievable colors
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SWAN

Added year ago by Beata

145

Puzzle_wiosna_1 - spring landscapes beautiful nature
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Puzzle_wiosna_1

Added year ago by vlp

604 1

white owl - our beautiful world of nature
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white owl

Added year ago by reniulek

70 2

dodo puzzle - dodo jigsaw puzzle dodo
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dodo puzzle

Added year ago by tre

59

xd is pepe - xdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdxdx
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xd is pepe

Added year ago by pepe

91

lovely animals - cat talk with a dog
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lovely animals

Added year ago by Basiunia

17

koliberek - Hummingbird is a beautiful flower
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koliberek

Added year ago by emi

54

spring - spring swan
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spring

Added year ago by iga

82

tired duckling - I got tired very much and I need to rest
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tired duckling

Added year ago by reniulek

97

Fairy tale - Krecik has gained popularity among children in over sixty countries. It is recognizable all over the
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Fairy tale

Added year ago by capitan

75

POLISH EMBLEM - POLISH EMBLEM FOR SPANISH FRIENDS
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POLISH EMBLEM

Added year ago by MARGARET

78

Colorful animals - Nice, nice picture.
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Colorful animals

Added year ago by Iza

75

Angry Birds - Angry Birds - a series of computer games launched in December 2009 by Rovio Mobile, in which players
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Angry Birds

Added year ago by angrybird

31

Angry Birds - Angry Birds - a series of computer games launched in December 2009 by Rovio Mobile, in which players
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Angry Birds

Added year ago by angrybird

37

Angry Birds - Angry Birds - a series of computer games launched in December 2009 by Rovio Mobile, in which players
Play now!
Angry Birds

Added year ago by angrybird

7

Angry Birds - Angry Birds - a series of computer games launched in December 2009 by Rovio Mobile, in which players
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Angry Birds

Added year ago by angrybird

19

Angry Birds - Players take control of a flock of birds trying to retrieve the eggs they have stolen from the evil
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Angry Birds

Added year ago by angrybird

23

Angry Birds - Players take control of a flock of birds trying to retrieve the eggs they have stolen from the evil
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Angry Birds

Added year ago by angrybird

43

Angry Birds - Players take control of a flock of birds trying to retrieve the eggs they have stolen from the evil
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Angry Birds

Added year ago by angrybird

40

Angry Birds - Players take control of a flock of birds trying to retrieve the eggs they have stolen from the evil
Play now!
Angry Birds

Added year ago by angrybird

26