The seal is the most dangerous enemy. While they are in the ocean they learn how to feed themselves. Adelie penguin mostly eat krill, fish and squid. They also need water. Most penguins live in ice caves.
Some penguins stay in the water for up to five months without coming to land.
The reason they will stay in the water so long is because they get all their food there. Adelie eat when they are hungry. They always come up for mating season. During mating season they build nests. While they are mating, they have to have a nest.