The handprint is a cave painting drawn 32,000 years ago and one of the oldest portrait of human. The Chauvet Cave was soon regarded as one of the most significant pre-historic art sites. Most of the artwork dates to the earlier, Aurignacian, era (30,000 to 32,000 years ago).
Me, Myself, Good by Michael (a silverback gorilla)
Gorillas are taught sign language. One can see that Michael signed with his own handprint.
The Gorilla Foundation : http://www.koko.org