Yellowstone national park is home to a large variety of mammals, birds, fish and reptiles. There is almost 60 species of mammals, 60 species of birds, 18 species of fish, 6 species of reptiles and 4 species of amphibians.
The rarest mammals in Yellowstone are Mountain lions and lynx, there are only 25 of Mountain lions and lynx haven't been seen since 1989.
The most common mammals are elk. There are more than 30 000 Elk from different herds.
We can find other mammals in the park that are very common, like Bison, Coyotes, Wolves, Moose, Bear, Bighorn sheep, Mountain Goats.
Wolves have a very interesting story in Yellowstone park. They were native to Yellowstone when they established the park in 1872. Between 1914 and 1926 at least a 136 wolves were killed. By the 1970s, scientists found no evidence of a wolf population in Yellowstone. They reintroduced them in 1995. The currently exist in several packs. As the wolf population has grown, the elk population, the favored prey, has declined.
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