Boa constrictors, long popularly thought to be stranglers or suffocaters, actually kill prey by squeezing until its heart stops. A clever study used simulated hearts placed within dead lab rats so that scientists could control when the "heart" stopped. Indeed, boas would modulate the pressure of their "squeeze" based on how strong or faint the victim's heartbeat was. And when the scientists kept the artificial heart beating well after any rat would have died, the snakes kept writhing and constricting in an obvious continued attempt to kill the prey.

The question all cognitive scientists are wondering: does this count as theory of mind (being able to imagine what someone else is thinking)??

"Be still, my heart!"