To unlock Allosaurus I needed a dino to have 3 victories. I have a compound with 3 T-Rex where one had two victories so I thought incubate a bunch of Velociraptors and have them fight the T-Rex. Maybe one of them are unlucky enough to lose and will be able to research Allosaurus. Sure it worked fine but my yaw almost dropped when saw 5 Raptors working together and killed the T-Rex. Man that was fun to watch did not know they cooperated like that on larger targets.