Snakes are able to prey whole because of
how their jaws are not fixed together which allows them to have 4 separate jaw bones which can move seperately. Instead they are connected by ligaments
which allow snakes to swallow food much bigger than they are. And to push the
food down their throat, the snake will wiggle his head back and forth until the
food has entered the stomach. This process is made easier for the snake because
of how it’s throat can crush the food with incredible force and how it’s glands
secrete salivary juices which moisten the food item.
Here's a cool video that shows a perfect example of how Snakes eat their Prey.
http://video.nationalgeographic.com/video/animals/reptiles-animals/snakes/deadliest-rock-python/
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