What Yamitaifu said.
It's also worth pointing out that a prey item that's stopped moving isn't necessarily dead. Depriving the brain of oxygen will cause and animal to lose consciousness long before death. That's why constrictors continue to squeeze for some time after movement stops. It's believed that the snake can feel the prey's heartbeat, and uses that to know when it's safe to start chowing down.
Um...
That's a little disturbing. Just sayin.
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