In terms of swallowing huge things, most snakes are quite remarkable - all snakes are predators, and some quite spectacular ones, with an African rock python found by explorers having swallowed a 140-lb boar. Usually, the snake swallows the prey head-first, so all the limbs simply "fold down".
But some things are just too ungainly to swallow whole, such as crabs. So what do they do?
They rip the crab apart!