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  • Animals
  • Mammals
  • Birds
  • Animalia kingdom
  • Reptiles

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They have settled all the corners of our planet. We know the animals that live in cities, villages and forests. These are butterflies, bees and other insects, spiders, worms, birds and fur-covered mammals - cats, dogs, deer, squirrels, bears. But many amazing creatures also live in places that people rarely visit like deserts, swamps and seashores. The wildlife of tropical rainforests and coral reefs is particularly diverse.

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These are warm-blooded animals, meaning they can independently maintain a constant body temperature. Thanks to their warm - blooded nature, mammals can live almost everywhere - even in the icy polar seas and tundra. Most animals live on land. Almost all mammals have 4 limbs.

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These animals are apparently descended from reptiles that appeared on Earth more than 150 million years ago. Scientists have discovered a skeleton print of one of the oldest birds in the rock. They named it Archaeopteryx (translated from Greek - "ancient wing"): along with numerous features of reptiles (teeth, tail like a lizard), it was covered with feathers and had wings. In the course of evolution, birds gradually lost the characteristics of reptiles and improved.

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Scientists distinguish between 5 kingdoms, that is, the main groups of living beings. Most of all, the animal kingdom. Zoologists have described more than a million species of these organisms that have several common features. These are multicellular organisms whose body consists of a large number of cells.