According to the zoologist statistics on earth, is known about 1.5 million animals.
Animals can be divided into vertebrates and invertebrates two kinds big.
Invertebrates body no spine, most individuals is very small, but many kinds, accounting for more than 90% of the whole animal species. For example flies, mosquitoes, worms, butterfly, etc.
Vertebrates and can be divided into fish, amphibians, reptiles, birds and wild animals five groups.
Fish including water fish and freshwater fish a total of 25000 ~ 30000 kinds, such as the carp.
Amphibians, there are more than 2000 kinds, such as frog.
There are more than 3000 kinds of reptiles, such as snakes.
Birds have 9000 kinds, such as doves.
Earth has more than 4500 kinds of, like a horse.