Some gorillas may eat monkeys: Study

A recent study that found monkey DNA in the feces of wild African mountain gorillas, has hinted that some gorilla species eat monkeys, and are not entirely vegetarian as earlier presumed.

While some zoo specimens are known to eat meat, wild gorillas eat only plants and fruit, along with the odd insect-as far as scientists know.

But now, according to a report in National Geographic News, a recent study found DNA from monkeys and small forest antelopes called duikers in the feces of wild African mountain gorillas in Loango National Park in Gabon in Africa.

The discovery raises the possibility that gorillas might have a secret meat habit-scavenging or hunting discretely.

There may well be more mundane explanations for the surprising finding-explanations that'd have to be ruled out before gorillas could be reclassified as meat-eaters, according to study co-author Grit Schubert, a primatologist at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany.

For example, gorillas are known to eat ants that scavenge the carcasses and bones of monkeys and other mammals.

When gorillas eat the ants, they may also be ingesting-and later expelling-the mammal DNA in the ants' digestive tracts, the study authors speculate.

Another possibility is that the mammal DNA came from live monkeys or duikers that had been probing the gorilla feces for edible seeds or other leftover plant bits.

Or the mammals "might have just licked it, sniffed it, or peed on it," Schubert said.

"There's plenty of opportunities" for adding mammal DNA to gorilla scat after the fact, Schubert said. "I don't really think they're eating meat," he added. If gorillas do eat meat, they wouldn't be the first great apes to do so.

Chimpanzees and their bonobo cousins are known to hunt and eat other mammals, including monkeys.

Plus, "most herbivores can digest meat quite well," said study co-author Michael Hofrieter, a geneticist also at the Max Planck Institute. "It just does not work the other way around," he added.