, March 10 -- Scientists have found possible evidence suggesting that some killer whales may hunt and eat their own species in waters near Russia.

The discovery comes after two severed fins of killer whales were found on a remote Russian island. According to a recent study, both fins carried clear tooth marks from other killer whales, raising concerns that some orcas may be attacking members of their own species.

Dr. Olga Filatova, an associate professor at the University of Southern Denmark, said she first saw photographs of the fins sent by her long-time collaborator Sergey Fomin. She said the discovery was unexpected.

"When he found the first one, it was very surprising," Filatova told BBC Science Focus, adding that scientists never...