Adaptations only occur, under the theory of evolution, when there is something in nature for the animal to adapt to. So, in other words, apes in one part of the world live there, and fill in a new niche in the environment and apes who don't fill in the new niche or live in another geographic area don't adapt.

I suggest reading up on the process of Natural Selection, it will shine light upon many of the questions I assume you have.