Image: Tyrannosaurus rex, brain
Tyrannosaurus rex brain fossil cast. USA, Late Cretaceous, 73 - 66 million years ago.
- Robert Jones
- © Australian Museum
For its body weight, the brain size of Tyrannosaurus rex was comparable to many modern reptiles. A cast of the brain reveals that it had enlarged olfactory lobes - the parts of the brain responsible for the sense of smell. This sense must have been important to T. rex.