[metmom]

The niche didn't change for 11 million years? If the niche did change then the rat squirrel wouldn't have been so well adapted for it, and would theoretically, therefore had to change to fit the new niche.

[R. Scott]

The niche didn't change for 11 million years?

There are several areas that haven’t changed much in 11 million years – that’s not a long time in geologic terms.