There are some unidentified species throughout the AVP universe. For example, the heads and skulls on the predator's trophy wall in Predator 2. One of them is a T-Rex-like creature with a second lower jaw and dreadlocks. This creature is thought to be a Galar, as seen in the Alien vs. Predator series of books. Another skull on the wall was that of a Predator-like creature that has no eyes. This creature is thought to be a Predox, a species very similar to the Predators. Next to the Xenomorph skull there is also a skull with ridges and bumps. And other, dinosaur-like extraterrestrial skulls, including that of a triceratops. Yet another skull in AVP2:R is considered by some to be a Space Jockey helmet taken as a trophy much like the old pistol from Predator 2. But it may also belong to a completely unrelated creature similar in appearance due to the wall being a display for skull trophies.