Krill, a very, very, small shrimp like animal, live under the sea ice that is melting away rapidly. The krill are moving away and they are becoming harder to find. They are an important food source for a lot of sea life. A single whale will eat hundreds of thousands in a day. Walrus, seals, and polar bears are leaving their pups on unstable icebergs, and going further out to sea in search of food. Sometimes they go so far that they get lost.