Orcas, like all whales, are mammals — they breathe ... their ancestor may have been like is the chevrotain, a small deer species that dives into water when threatened, hiding from predators ...

and the deer even eat the poop of the monkeys. It all makes for a close relationship the researchers refer to as a "strong cohabitation." Since the animals are such different species -- varying ...

The Key deer are an "umbrella species that is helping all the other animals that need this habitat as well," wildlife biologist Christina Wilson said to CBS. The animals "play a huge role in the ...