They may not be, as others have pointed out, but on the other hand, humans have disrupted their environment and put them under extreme selective pressure of various kinds. We have also reduced their population, creating a greater likelihood of inbreeding, which allows new variations to spread very rapidly throughout the remaining population.

So it isn't our observing them that is relevant. We may be putting pressure on them that is driving their evolution, and evolutionary change can happen very rapidly when the pressure is high.