Corrected entry: When Ian and Dave are swimming in the ocean, Ian says his pelican feet are not removable, but later on in the film, when The Chipmunks are making a raft, they use the feet for oars.
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Correction: They rip them off the suit, which is something Dave and Ian can't do while floating in the ocean. It's probably done with the pocket knife. But they're frayed at the edges from ripping or crudely cutting them off.