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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.
lovely animals - purple no - disconnectors
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lovely animals

Added 2 months ago by Basiunia

130 1

penguins - the beauty of penguins
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penguins

Added 3 months ago by MF8

39

lovely animals - birds, insects - butterflies, flowers. Picture puzzle.
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lovely animals

Added year ago by Basiunia

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lovely animals - yellow, small ducklings
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lovely animals

Added year ago by Basiunia

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little boy - I'm running away and you're gonna bury me
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little boy

Added year ago by Basiunia

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pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

151

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

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pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

95 1

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

35

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

29

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

160 1

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

35

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

50

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

25

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

35

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

18

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

48

pets and animals - beautiful animals and even more beautiful
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pets and animals

Added year ago by żaba

9

blue bird - heavenly bird, blue bird
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blue bird

Added year ago by żaba

49 2

koliberki - hummingbirds while eating
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koliberki

Added year ago by żaba

52

nice jackdaw - Very friendly girl at the Kosciuszko square in Gdynia.
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nice jackdaw

Added year ago by Mariusz

43

Jigsaw puzzle - complicated puzzle
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Jigsaw puzzle

Added year ago by andi

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Jigsaw puzzle - complicated puzzle
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Jigsaw puzzle

Added year ago by andi

26

composite - a bird among beautiful flowers
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composite

Added year ago by lolo

41

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

15

sweet owl - Little owl on a red background
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sweet owl

Added year ago by juli

28

colorful parrot - colorful domesticated parrot
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colorful parrot

Added year ago by bxb

73

a beautiful landscape - A swan swims the plants
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a beautiful landscape

Added year ago by Halinka

496 1

nest of storks - conference of the family of bucians
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nest of storks

Added year ago by Julita

51

who got lost? - funny bird of prey
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who got lost?

Added year ago by ewunia x

19

Penguins - Penguins are non-flying birds (formerly called "lilacs") inhabiting the southern hemispher
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Penguins

Added year ago by Jasiu

45 1

pimgwiny - penguins in winter on ice
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pimgwiny

Added year ago by Piotr

226

Holy Spirit - arrange a puzzle and you will get the topic of the lesson
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Holy Spirit

Added year ago by jan lipińsk

55

Easter - hen in short pants
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Easter

Added year ago by Beatrycze

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Easter - you have to dress up on holidays
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Easter

Added year ago by Beatrycze

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Easter wishes - chickens, guns, lettering, mines
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Easter wishes

Added year ago by wieslawa

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