Hawks Coach beat me to it but this is a great line
He has a big saggy chin that functions as a "resonating" chamber so he can howl. The howls can be heard for several miles ... and allow the monkeys from one group to communicate with other groups. They communicate to defend their territories, telling other monkey groups not to come there because it is where they live.
This is where they live... HOOOOOOWWWWWLLLLL!
Nice,nice.