The Rumblehorn is a large grassland Insectivore.
It's horn is actually a hollow resonance chamber.
The bony growth is an adaptation of the sinuses in the front of it's skull. It presses the horn against
the tall trees where it picks up the subtle vibrations of grubs and other insects burrowing
under the bark. It uses it's chisel-like teeth to scrape at the bark of the trees, and a flat
raspy tongue to collect the infestations of bugs.
It must eat nearly a hundred pounds of insects every day.
When it is not foraging for food, it sleeps for fifteen or more hours each day to conserve energy.
The rumblehorn also uses it's horn in communication.
Blowing air across stiff bristle structures on the soft palette of it's mouth, the rumblehorn
emits a strange warbling thrum that is responsible for it's name.