As we know, populations of species will naturally align themselves to the available energy of their environment. Barring any external influences, such as natural predators (or as we'll see, sterilization programs), if a species' numbers get too high, their population will collapse, only to grow again, and collapse again, ad infinitum.
(Incidentally, Honi Mundi once attended a NPS ranger talk about the subject in Rocky Mountain National Park, where the lack of natural predators forces the park to cull and sterilize the local caribou population)
Luckily, on Ko Phi Phi, the Lanta Animal Welfare organization periodically sets up shop to remove the uteri and testicles of unsuspecting cats.
