Because they're all apart of an important food chain.
Krill are eaten by fish, which are eaten by penguins, which are eaten by seals, which are eaten by killer whales. I guess your thinking, then what does the Antarctic Blue Whale eat? They eat krill as well. See how it's turning into a food web?
Antarctica's coastline serves as breeding territory for sea mammals and sea birds that live in the Southern Ocean.
in Antarctica
No animals are used for transport in Antarctica.
There are no native animals in Antarctica.
Antarctica contains a variety of animals which are adapted to that particular environment.
No animals live in Antarctica.
No animals 'live' in Antarctica. Some sea animals, including sea birds, come to Antarctica's beaches to breed.
No animals are used for transport in Antarctica.
There are no animals that live in Antarctica.
None, no animals live in Antarctica.
There are no animals found in Antarctica.
There is no food chain for land animals on Antarctica, because there are no land animals that live there.