The flippers and their webbed feet make penguins very good swimmers. Penguins short, crowded feathers make a waterproof coat. Thick layers of fat keep them warm. When penguins get too hot they fluff out their feathers. Baby penguins can't fluff their feathers because their already fluffy.
Penguins eat squid, fish, krill, and other sea animals.
Penguins protect themselves by biting or beating their wings to show their strength. Their tough hide helps them protect themselves too. Penguins' enemies are Leopard Seals, Orcas, and Sea lions for penguins in general. Petrels, seagulls, and other birds snatch the eggs, babies, and very old, weak penguins. Sometimes Leopard seals will thrash penguins back and forth and break their neck to kill them and then they eat them.