From the Super Mario Wiki
Sir Flap-A-Lot is an enemy that appears in the game Wario: Master of Disguise. Sir Flap-A-Lots appear in Blowhole Castle during Wario's adventure there. They are robotic red birds that are of the same species as its other robotic counterparts, but these are the only ones that can fly. They attack Wario by breathing blue fire. They can receive and give damage once a spirit switch has been activated to its solid state.
"A strange bird that wears crimson armor and flits about the mansion. Some think that this wee bird actually runs the place, but this is only a theory."