Rumble-rumps are continuously emitted during the courtship, and can even start before the male sees the female. The name comes from the two distinct sounds, the rumble and the rump. The crunch rolls and grind-revs are observed right before the pre-mount display.
During courtship, males emit continuous rumbling sounds, sometimes starting before they see the female. This distinctive sound is called a rumble-rump.  The name comes from the two distinct sounds: the rumble and the rump. Before mating, there are also crunch rolls and grind-revs observed.