These Pokemon are capable of some of the longest lives in the wild due to their flexible waking schedules and ability to fool predators with a false death.
It can shut off its pulse to create the illusion of death. This ability causes an unknown effect in predators that make it leave it alone, allowing it to survive.
When in danger, it goes rigid and shuts off its own pulse, giving the appearance of a dead animal. This trick usually works, but not always.