I don't get the comment, Indians do use contraceptives, the wrong type for the wrong reasons unfortunately
Sex-selective abortion - Wikipedia, the free encyclopedia
Controlling the land population is a doddle, Oceans will be a bigger problem, but we should have it licked before long.
By the middle/latter end of this century there won't be a square inch of the planet that we aren't constantly monitoring.
Edit : "what makes you think it'll work with animals slightly less intelligent?"
They are, compared to us, dumb.