Mammal bones, especially skulls, are used for identification, and to work out the evolutionary history of each species. The jaws of a house cat are more lion- than wolf-like, for example. The teeth of horses and zebras look alike. The ear bones of mammals were once the jaws of prehistor...
who had been sent some fossilised triceratops horns. At first, he thought that they belonged to an extinct species of bison. However, after later seeing other ceratops specimens, he realised that they were from a dinosaur.