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likeafieldmouse:

The Lobed-tooth Crabeater Seal

"The mouth of a crabeater seal is uniquely adapted to feed on Antarctic krill by acting like a sieve. A hungry crabeater will take a mouthful of water, close its jaws, squeeze the water out through its teeth and filter out all the krill, which it then consumes.These microscopic krill comprise over 90% of the crabeater seal’s diet (despite its name, the crabeater seal does not actually feed on crabs).”