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How many kinds of animals are there in the world?
The content is as follows:

I. Mammals

Tiger, wolf, rat, deer, mink, monkey, tapir, sloth zebra, dog, fox, bear, elephant, leopard, musk ox, lion panda, warthog, antelope, reindeer, koala, rhinoceros, lynx, pangolin giraffe, panda, anteater and orangutan.

Otter, civet, dolphin walrus, platypus, hedgehog, arctic fox, koala, polar bear, kangaroo, armadillo hippo, seal, whale, ferret.

Second, amphibians and reptiles

Catfish, pythons, crocodiles, monitor lizards, alligators, tortoises with four claws, tortoises with hawksbill, giant salamander green turtles, terrapin turtles, geckos, tiger frog, leatherback tortoises, wart salamander, wart salamander in Zhenhai and wart salamander in Guizhou.

Third, birds

Eagle, heron, goose, penguin, hornbill, gull, falcon, stork grouse, booby, parrot, mandarin duck, woodpecker, owl, ostrich kingfisher, swan, hummingbird, albatross, crane, pheasant, nighthawk, etc.

Related content explanation:

Animal are a kind of living things. They generally feed on organic matter, things that can feel, move, move autonomously or move. Including people.

According to fossil research, the earliest animals on earth originated from the ocean. After a long geological period, the early marine animals gradually evolved into various branches, enriching the early life forms of the earth. Prehistoric animals appeared before the appearance of human beings, and prospered in their respective activities. Later, they became extinct in the ever-changing living environment. However, the animals on the earth are still evolving and multiplying from low to high and from simple to complex, and have today's diversity.