I've read somewhere that the two phobias that seem to be inborn and common to all infants are fear of falling and fear of sudden loud noises. They did some great research on the fear of falling in infants--I remember seeing the films of the research in my Visual Perception class in college. Phobias about animals seem to vary more from person to person. Like...I like snakes, bats, don't really mind rats, like mice. But bees, especially yellowjackets---reduced to a screaming girl.