I read years ago that snakes do this with dead prey to ensure it is dead. When they take live prey they can feel the transition when the feeder's heart stops beating, which is one of the triggers they instinctively use to know that they prey is truly dead. I don't know how true it is, but I do know that my f/t feeders all constrict the prey for a very long time while the few that only eat live cut it loose as soon as it's dead.
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