A Geoffroy's Spider Monkey hanging on the branch. Photo from Primate Info Net.
Wild Geoffroy's Spider Monkeys (Ateles geoffroyi) or Black-handed Spider Monkeys had been documented using tools to scratch themselves, according to a new publication "Tool use in wild spider monkeys (Ateles geoffroyi)". Important to note that spider monkeys do not have thumbs, only four fingers (picture below) so tool manipulation is rather limited but nonetheless a rather interesting find.
The hand of a Geoffroy's Spider Monkey. Note that they do not have a thumb and only four fingers. Photo from Wikipedia.
Published in the latest issue of Primates, authors Stacy Lindshield and Michelle Rodrigues collected their data from wild spider monkeys at El Zota Biological Field Station in northeastern Costa Rica. There were three documented instances where these spider monkeys used tools to scratch themselves.
The first to scratch was an adult female. Holding a small, leafy branch in her hand, she scratched her chest and abdominal regions.Seems that this publication coincide with the call for an inter-disciplinary field that seek to examine primate tool use in a long term, evolutionary context. Julio Mercader, archaeologist from University of Calgary, said "We used to think that culture and, above anything else, technology was the exclusive domain of humans, but this is not the case."
The second, another adult female, used a detached stick lacking side branches and leaves to scratch her left side. She chewed the tool tip between bouts.
The third individual, a juvenile female, first chewed the distal tip of a stick before scratching the underside of her tail and her genital region.
Read the full article on Discovery: Spider Monkeys Invent Medicated Body Scratcher.