pram bug

Though it’s only an inch (2.5 centimeters) long, the tiny Phronima crustacean is still a pretty vicious customer. Females prey on small marine animals called salps by using their mouths and claws to devour the salp’s insides and then hollowing out the corpse. The “pram bug” then lays her eggs inside the victim’s body cavity to create a mobile, gelatinous nest for her young.