A Bull Alien has two horns on its head, and is very quick and powerful. This large Xenomorph variant can knock down military vehicles by rushing in, much like its host. It is also very durable, capable of taking a rocket to the face without even flinching. Only fire seems to kill them.
Bull Aliens commonly operate in herds, another trait they inherit from their host.
The bull alien has a similar demenour to both the Rhino Alien and the Crusher, due to the fact that they are all extremely aggressive and use their large heads to ram their opponents.