Will currently LOVES animals--reading about them, pointing them out on the street, doing the animal noises, etc. He knows the animal noises for cow, sheep, horse, frog, cat, dog, lion/tiger, and a new addition...owl (hoohoo). I particularly love that he uses different inflections for the different types of animals, e.g., the "meow" for the cat is said in a high-pitched squeak and the "ribbit" for the frog is throaty.
In keeping with the animal theme, one of Will's favorite books is "Moo, Baa, Lalala" by Sandra Boynton. (I am consistently amazed that she gets paid lots of money to write this stuff. "A cow says 'Moo'." is not revolutionary.) Anyway, it's a cute book, but has one drawback: I now think Will believes that pigs say "Lalala".