Authenticated (06/02/06) by Matt Richardson, independent primatologist and writer.
Arboreal: Living in trees.
Diurnal: Active during the day.
Primary: Primary rainforest is rainforest that has remained undisturbed for a long time and has reached a mature condition.
Secondary rainforest: Rainforest that has re-grown after a major disturbance, such as fire or timber harvest, but has not yet reached the mature state of primary forest.
Subspecies: A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.