Today.
We know of more than 1.5 million species of animal.
New species are being discovered constantly.
It is estimated that living animal represent less than 1 percent of all the animals that have ever existed.
There are more than 15,000 species of mammals know to exist today.
Of those, there are hundreds of species of ruminants.
Through natural selection and human domestication, certain species have become predominant in specific regions of the world.
Humans and domestic animal have developed a synergistic relationship.
The domesticated animal have flourished and in turn have provided humans with food, fiber, transportation and draft power.