Singer is an animal rights nut, too. Here's a link:
http://icarus.cc.uic.edu/~strian1/
A quote from the professor:
"If we compare a severely defective human infant with a nonhuman animal, a dog or a pig, for example, we will often find the nonhuman to have superior capacities, both actual and potential, for rationality, self-consciousness communication, and anything else that can plausibly be considered morally significant."