Question

who many types of animal​

Answer 1

Answer:

Explanation:

Nobody knows how many species of animals there are, and by the time anyone has an exact number, many of them will be gone.

Discovered species

This site [1] says that there are 1,277,021 named species of animals, as of 2008. Named means that scientists know about them. These numbers are pretty good for large animals, like the 4,381 species of mammals and 9,271 species of birds. There probably aren’t a lot of undiscovered mammal and bird species.

But the biggest groups are the 915,350 insects and 92,909 spiders/scorpions. Many of these are hard to find because they are small and live in obscure places, often in the tropics. It’s really hard to be sure that you have found every last bug in a given piece of jungle.

Many of the remainder are aquatic invertebrates. It’s really hard to survey the ocean.

Look alike species

Even if you can survey all species, it isn’t always easy to tell whether two similar looking animals belong to different species. Are the Western and Eastern meadowlarks two species or one?[2] Really hard to tell, isn’t it?

Or how about these butterflies?[3] They look identical to me.

Undiscovered species

So, scientists try to develop clever ways of guessing. One approach is to close off a tiny region of a jungle and go through every scrap to find every last bug. Then they try to see what fraction of them is a member of a named species. That gives you the fraction of undiscovered species which you can then try to apply to the entire Earth.[4]

Another approach is to look at the history of scientific discoveries. This chart plots the number of phyla, classes, orders, families, and genuses, that have been found since 1750. When the orange-yellow line begins to flatten out, scientists conclude that most items have been found. It looks like scientists have discovered most of the phyla, classes, orders, and families of animals.[5] But the number of new species continues to climb by roughly 10,000 per year.[6]

You can use growth rates like that to guess when the number of genus and species will begin to level out. That method leads scientists to predict that there might be 7,770,000 animal species on land and 2,150,000 species in the ocean.[7]

Another approach is to look at body size; smaller species are more likely to be undiscovered or discovered only recently. This chart shows that the average body size of named beetle species has been decreasing as more and more of them get discovered.

Answer 2

there are two types of animal insect Bird