I mentioned earlier on Taxacom that the closed-mouth smile appears to be unique to humans and orangutans. After further communications with several primatologists this characteristic appears to still hold true. I now have a color picture of an orangutan with the smile at: http://www.sciencebuff.org/primates/Human%20origins/Orangutan-human/Evidencefororangutan.htm It is located at the bottom of the page under potential synapomorphies. John Grehan Dr. John Grehan Director of Science and Collections Buffalo Museum of Science 1020 Humboldt Parkway Buffalo, New York 14211-1293 Voice 716-896-5200 x372 Fax 716-897-6723 jgrehan at sciencebuff.org http://www.sciencebuff.org/biogeography/Panbiogeography/Panbiogeography-Gate.htm http://www.sciencebuff.org/HepialidaeGate.htm