There are several ways in which scientists interpret soft parts based on a dinosaur’s skeleton. For example, some muscles leave attachment scars on well-preserved bones. The size of an animal’s skull sometimes tells us the relative size of the brain. The holes and hollow spaces in the bones could indicate pathways for nerves. Most importantly, the comparison of dinosaur bones to those of living animals can give us a good idea of the size, anatomy, strength of certain dinosaurs, and sometimes the internal configuration of a dinosaur’s organs.