OT - Shouting monkeys show surprising eloquence. Monkeys string sounds together to create meaning.

A novel combination of calls in the lesser spot-nosed monkey communicates a special meaning distinct from the meaning of its individual components. Fascinating.

http://www.nature.com/news/2006/060515/full/060515-11.html

The use of an existing call in a novel context is also interesting. I once observed a female red-bellied lemur drop into the sub-canopy and give an infant collecting call to her family (there was no infant) after hearing the mobbing calls of a nearby bird. (The bird was responding to a circling hawk). The infant-collecting call is rare to begin with and I never heard it given to any other adult any time before or after that one incident. Normally, a "I'm over here. Come find me" type call between adults is a two-syllable sneeze-type call.