Despite its name, Crabeater seals don't eat crabs. Rather, they were poorly misnamed by early Antarctic whalers and sealers. Crabeater seals have teeth that have been adapted to eating Krill, which is the primary food source. As Crabeater seals are the most populous of all seal types on the planet, they are also, perhaps unsurprisingly, the number one consumer of Krill on the planet (take that, Humpback whales!).
It's a pretty safe bet that you'll see a fair number of these seals on a trip to Antarctica. Their habitat encompasses the pack ice zone that advances and retreats throughout the year all around Antarctica. Even though they are quite numerous, it's still an incredible experience to spot them in the wild, and watch them from a Zodiac.