 And they have two pits on their heads. And these pits are heat sensors. Now rattlesnakes are reptiles, which means they're cold blooded. And these heat sensors are seeking out food. That's why a rattlesnake has venom. It's a food gathering mechanism. It's not meant to as a defensive mechanism. So if it senses heat, say the size of a fist, it's going to say, hey, there's dinner. And it's probably going to be a chipmunk, a small squirrel, something in the smaller rodent family.