Natural enemies include... (Score 5, Funny)

Natural enemies of the penguin include seals, Killer whales, and, in the case of young chicks and eggs, several species of seabirds. Healthy adult penguins have no predators on land, so they have no natural fear of humans. While they don't like to be approached directly, these naturally curious birds will sometimes come quite close to a quiet observer to get a better look.

http://www.antarcticconnection.com/antarctic/wildl ife/penguins/index.shtml

Sheesh slashdot editors, at least do a simple google search first!