These Dinosaurs Had a Complicated Air Conditioner in Their Skull
Horns, spikes and bony plates—dinosaurs developed many adaptations to protect themselves. But paleontologist Lawrence M. Witmer has discovered that a group of dinosaurs called ankylosaurs had a secret weapon. It was even more important than their tanklike armor, and it was hidden inside their skull: their nasal passages.
Ankylosaurs' thick full-body armor protected them from predators, but it did not allow much heat to escape from their huge body. Paleontologists were puzzled at how these animals were able to regulate…