Look! Monster snake swallows a crocodile in South America

Residents of the Southwestern United States likely have heard the distinctive buzz of these pit vipers. Their namesake rattle is a highly effective wα?ning sign, signaling ρ?eɗαto?s to stay away.

“Rattles are segments of keratin that fit loosely inside one another at the end of the snake’s tail,” explained Sara Viernum, a herpetologist based in Madison, Wisconsin.