Casque: The Amazing Headgear of Animals

animal anatomy · birds · reptiles · adaptation

Bony head bumps. A casque is a large bony growth on the head or face of certain animals. You'll find them on some birds, reptiles, and amphibians, usually on the upper jaw or the top of the skull.

Makes calls louder. One of the coolest uses of a casque is like having a megaphone built into your head. The hollow casque can act as a resonance chamber that amplifies an animal's calls, making them louder and easier to hear across long distances.

Shows who's in charge. A casque can tell other animals important information about who you are. It might signal whether you're male or female, whether you're fully grown, or what your rank is in your group, kind of like wearing a special badge.

Weapon in battles. When animals with casques fight each other over territory or mates, their head bumps become protective armor and even a battering ram. The casque helps reinforce the beak and skull so they don't get hurt during these clashes.

Temperature control. Some scientists think casques might help animals stay warm or cool by absorbing or releasing heat. This would be especially useful for reptiles and amphibians that rely on the sun and shade to manage their body temperature.