How many species of animals inhabit the Earth?

No one can say this even approximately. Reputable scientists, zoologists and researchers name different numbers, the difference between which can be several million. So far, science knows 2,000,000 species of animal organisms. But this number is very inaccurate. This is due to the fact that many species have not yet been discovered. Most of these species live in the depths of the seas and oceans. Also, about 3 species die out every hour. The data is constantly changing, there is not enough information about animals, so it will never be possible to find out the exact number of species.