Penguins are cute but deadly (to fish, krill, squid, crabs) and all of those animals are aquatic which means they're from the sea. Penguins are mostly aquatic animals they spend 55% of their time in the sea. Unfortunately penguins only live up to 15-20 years. Penguins are very fast (in water) in fact they can swim up to 4-7mph. Although, penguins eat quite tough food they don`t have any teeth, instead they have little spines on their tongue to get a grip on wriggly food.