https://www.kqed.org/science/1933532/whack-jab-crack-its-a-blackback-land-crab-smackdown
Whack! Jab! Crack! It's a Blackback Land Crab Smackdown | KQED
These Caribbean crabs will tear each other limb from limb. Luckily, they molt and regrow lost legs.
blackback land crabit swhackjabcrack