It’s in the news again: a human being was seriously attacked by chimpanzees. That was the main topic I was asked about at my friend’s potluck last night: they wanted an explanation for this shocking behavior.


Baby chimp

Chimpanzees are adorable when very young, but they become unpredictable and aggressive as they mature.


This time the scene of the tragedy was Jane Goodall’s Chimp Eden sanctuary in South Africa. Although chimps are not native to that country, the facility houses orphaned apes who have been rescued from the widespread illegal trade in bushmeat and pets that occurs in many parts of Africa. The animals roam semi-wild in large fenced enclosures.

The victim is 26 year old Andew Oberle, an anthropology graduate student at the University of Texas at San Antonio. Passionate about chimps since childhood, he had volunteered at the sanctuary previously and had been back for a month to pursue his studies. According to news reports, Oberle was leading a tour group for the first time when he climbed over one boundary fence into a “no-go” zone and got close enough to a second, electrified fence for two adult males, Nikki and Amadeus, to reach underneath and drag him by his feet into their enclosure.

After being dragged nearly half a mile and mauled for some 20 minutes, Andrew was found by sanctuary staff, who fired shots to disperse the chimps. Andrew was driven to a South African clinic where he has undergone surgery and is now stable. Reports vary, but it seems that he lost his toes, ears and left arm in the incident.


Adult chimp
An adult male chimp is five times as strong as a human.

We may never be sure what prompted the males to attack this particular human, but chimps are known to be territorial. In defense of their land, wild adult males have been known to hunt down and kill their own kind. We witnessed a similar kind of behavior in captivity just last week, with the chimp infanticide at the LA Zoo; this also happens in the wild, when adult males sometimes kill infants in their group whom they are fairly certain are not theirs.

According to an interview with noted chimp expert Frans de Waal, many chimp researchers lose a finger or two to the animals. When I was a young intern at a chimp breeding facility many years ago, I knew a fellow-student who was missing a finger after getting too close to a chimp. At the time, I was surprised she was allowed to continue to work there after such a lapse. Now I think that experienced chimp researchers recognize that chimps are strong and wily, and that losing a finger is not that unusual in their line of work! And these are folks who know the risks and are often dealing with animals in a captive setting with safeguards—locks and bars—in place to keep people safe.

No wonder that tragedy can strike in less regulated surroundings. Notable recent cases in the U.S. occurred in 2005 (when a man visiting his former pet chimp Moe was viciously attacked by two neighboring males at a California sanctuary) and in 2009 (when a pet chimp named Travis in Connecticut mauled his owner’s friend, leaving her with no face or hands; the woman later underwent a face transplant).

Given our media’s cultural biases, chimp attacks don’t make the U.S. news when Africans are the victims, but that doesn’t mean that it never happens. A 2006 freak chimp escape at Sierra Leone’s Tacugama sanctuary (a reputable facility that IPPL has helped support for many years) left one African man dead. You can also sometimes find reports of chimp attacks on villagers in places like Uganda and Tanzania, often where humans are encroaching on chimp territory to carve out farms.  

More recently, last year bonobos (a.k.a. pygmy chimpanzees) attacked three of their human trackers at a field site in the Democratic Republic of Congo; the animals were rescued orphans from the Lola Ya Bonobo sanctuary, and an attempt was being made to release them back to the wild. Bonobos are close relatives of both chimps and humans, and in general they have a reputation as the most peaceable species of the three. (IPPL sent funds at the time to help pay for reconstructive surgery for the trackers, all of whom survived, though with terrible injuries.)

There’s a lesson in all of this, one that we humans seem to have a hard time learning: that chimpanzees and other primates are wild animals who organize their lives by rules we don’t fully understand. In our interactions with them, we need to respect their essential wild natures. Some people, like Andrew, have found out the hard way that caution is a necessity.


  1. Sharon on July 6, 2012 at 3:08 pm

    Fortunately, the two male chimpanzees who attacked the student will not be killed. It’s understood that they were just defending their territory: