Mammals(哺乳动物): Baby mammals are born from their mothers stomach.Any of various warm-blooded vertebrate animals of the class Mammalia, including human beings, characterized by a covering of hair on the skin and, in the female, milk-producing mammary glands for nourishing the young. Bats are the only flying mammal. The biggest mammal is the Blue Whale.
Example: people, dogs, elephants, etc.
Reptiles(爬行动物):Reptiles are cold-blooded animals. Baby animals are born from eggs. Any of various cold-blooded, usually egg-laying vertebrates of the class Reptilia, such as a snake, lizard, crocodile, turtle, or dinosaur, having an external covering of scales or horny plates and breathing by means of lungs.They usually have scales. Example: snakes, frogs, lizards, etc.
Birds(鸟类):Birds are animals that have feathers and wings, but not every one of them can fly. The ostrich is the biggest bird. Birds eat bugs, fish, corn... Example: sparrows, flamingoes, chicken, ducks, etc.
Fish(鱼):Fish have scales. They live in water and can't leave it. They don't have legs but fins and tails instead.Any of numerous cold-blooded aquatic vertebrates of the superclass Pisces, characteristically having fins, gills, and a streamlined body and including specifically: Example:clown fish, cat fish, gold fish,etc.
Insects(昆虫): Any of numerous usually small arthropod animals of the class Insecta, having an adult stage characterized by three pairs of legs and a body segmented into head, thorax, and abdomen and usually having two pairs of wings. Some insects provide good use for farmers. Insects include the flies, crickets, mosquitoes, beetles, butterflies, and bees.
The heaviest animal on earth: Whales
The tallest animal on earth: Giraffe
The fastest animal on earth:Jaguars
The slowest animal on earth: Snails
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