Revelatory ape maturity in Sumatra and Borneo
Posted Fri, 22 Mar 2013 10:18:00 GMT by Dave Armstrong
We don't see any normal lack of secondary sexual characteristics in the great apes - except in the orang-utan. The undeveloped male in these two species, without the large dewlap-like flange, cannot change back to this morph but usually develops into the mature morph over a variable period of time.
Revelatory ape maturity in Sumatra and Borneo