So, whatever these dinosaurs were doing with their arms, they were doing it with force. In movies, T. rex is always depicted with little bumps on top of its snout. Yes, all tyrannosaurids have slight bumps and ridges on their snouts, although they may be exaggerated in some film reconstructions. We will never really know why they had these bony bumps, but they may have served as some sort of social-signaling function, much like the antlers on a deer do today. Chimpanzees and gorillas are both members of the primate group, which includes mammals such as lemurs, monkeys and humans.
Chimps generally differ from gorillas several ways.
For example, chimps are smaller than gorillas and have larger and more conspicuous ears. In addition, female chimps are almost the same size as males, whereas female gorillas are much smaller than their male counterparts. Using collections like those housed at the Museum, scientists continue to debate the exact relationships among primates and often ask themselves questions similar to yours. Nearly all the mammals featured in our exhibits have been on display for at least 50 years, and some for more than 100 years. At the time they were collected, mammal populations were large and people were accustomed to hunting animals for food.