This means that it would be extraordinarily unlikely for the mud to have formed these shapes by chance. Unlike birds or mammals, the brains of crocodiles and alligators fill only about half of the endocranial space and are surrounded by tissue. This is very similar to that seen in the Allosaurus scan. In fact all the structures which can be made out seem remarkably similar to living crocodiles and alligators. This suggests that the internal structures which appear on the images were not generated simply from decay or a random collection of sediment.
Different animals have different brain structures depending on their lifestyle.
The part of the brain which deals with the processing of sensory information and controls complex behaviours based on that information varies enormously. A particularly dramatic difference in the size of this area and their behaviour is seen between alligators and birds - the two closest living relatives of Allosaurus . This can be demonstrated clearly in the way they feed. If alligators sense that something is food, they will eat it, almost as a reflex. Birds, however, are much more careful what they eat.