Recently, people have spotted killer whales engaging in some unique behavior. They are rubbing their bellies along the rocks that dot the British Columbia coast. At first, no one was sure exactly what ...

For eight hours, all they saw were dolphins and the spouts of humpback and gray whales. Then, the call went out.

Scientists have spotted a subset of killer whales using seaweed to scratch each other’s backs, marking the first known identification of “tool” usage by marine mammals. The “southern resident” killer ...