A Swoopula is a tougher gray version of the Swooper bat. There's not much difference between the two except Swoopula is more powerful. In the first Paper Mario, Swoopula repeatedly sucks Mario's HP until he claws it away from his body.

Paperswooper‎ Swooper Paperswooper
Types: Swooper | Swoopula | Swampire Characters: Sir Swoop