So we've got a small pocket of dwarves (aka vampires!) walled away safely, and my fort is infested with FUN (aka demons and devils!). They've killed 3 sieges now. Will they ever starve to death, or do I actively have to do something to get rid of them?
Only Dwarves and Tame animals can starve to death (at the moment, herbivores only).
The only way to kill them is with a trained army of vampire super soldiers - pity they don't drink (Alcohol dependency makes Dwarven Vampires move like Dwarven Syrup).