What is the lair or blank such as the home of a tiger lion or bear?

A lair is defined as a home or habitat in which an animal lives in. So, where an animal lives or coexists would depend on the type of animal. For example: Apes typically live in tropical rainforests. Sharks dwell and coexist underwater. Birds spend most of their time flying in the sky; in general, birds tend to build their homes in hollow-trees so that they're closer to their homes.

So a wild animal's lair simply is where it lives and coexists with others of the same species.