Dire Chicken
From Hack/Mine Wiki
Dire Chickens are a mob exclusive to the Hack/Mine mod.
Dire Chickens can spawn in any hazardous biome, and can also spawn from Dire Chicken Spawners. Dire Chickens also have the ability to hover/flutter like normal chickens, which can become a nuisance. They have low HP and inflict a moderate amount of damage, reaching deadly amounts in the higher levels.