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OMAHA, Neb. -- Scientists hope DNA analysis will reveal the origins of large, mysterious apes discovered in the heart of Africa by an Atlanta primatologist.

Genetics research has begun at Omaha's Henry Doorly Zoo on fecal samples collected this summer from the rare apes to determine if they make up a new species, a new subspecies or some form of hybrid, possibly a mix between a chimpanzee and a gorilla.

"It's a new, mystery ape, and we are doing the DNA fingerprinting to find out more," said Lee Simmons, zoo director.

The apes, which stand 5 to 6 feet tall and have feet nearly 14 inches long, were first documented last year by primatologist Shelly Williams in a forest in the northern part of the Democratic Republic of Congo.

They have bodies similar to those of gorillas but generally the facial characteristics of chimpanzees. Williams said the animals sleep on the ground at night like gorillas but eat a fruit-rich diet like chimpanzees.

"I can't speculate yet as to what they are. Their behavior is so unusual. It's a puzzle," said Williams, who has some video of the animals but no photographs.

Because of their size and elusiveness, the apes have no predators; not even poachers hunt them, Williams said. With no fear of lions, leopards or hyenas, the large animals hoot at the moon as it rises and sets, which is extremely unusual for apes, she said.

"The people are very afraid of them. They call them the lion killers because they are huge creatures," Williams said. "The folklore is, they could kill lions."

Williams collected fecal samples from the animals' nests before returning in June from her most recent trip to the Congo. In August, she delivered those samples to the Omaha zoo, where they are being compared with the DNA of captive gorillas, bonobos and chimps, said Ed Louis, a geneticist leading the research at the Omaha zoo.

"If this ends up being a new species of ape, that would be amazing. Even if it's a hybridization, that would be fascinating," Louis said.

Biologically, it is possible for a chimpanzee and a gorilla to have viable, fertile offspring, Williams said.

The DNA analysis is expected to take months.

Louis plans to join Williams on her next trip to the Congo, probably in November, to collect more specimens for DNA analysis.

"Without getting your hands on the animal, it's difficult to say what it is," said Louis, who has identified several new species of lemurs in Madagascar through his genetic research.

Williams made molds of the apes' footprints found near the nests. The footprints were nearly two inches larger than the average length of a gorilla's foot, which is about 12 inches long.

The last discovery of a great ape was in 1902, when mountain gorillas were found where the borders of the Democratic Republic of Congo, Rwanda and Uganda meet.

Russell Mittermeier, president of Conservation International, an organization that focuses on biodiversity conservation, has assisted in the discovery of six species of monkeys and marmosets in the Brazilian Amazon. He is not ruling out the possibility that the apes make up a new species.

"If this turns out to be a new species of ape, it would be one of the big discoveries of primatology," he said. "It has been so long since there has been a distinct discovery."

statesman.com