Authenticated (24/11/2006) by Dr. John P. Carroll, Chair of the IUCN-SSC/BirdLife International/WPA Partridge, Quail and Francolins Specialist Group.
http://www.gct.org.uk/pqf/
Primary forests: Forests that has remained undisturbed for a long time and has reached a mature condition.
Secondary forest: Forest 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.