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.

In the first known toolmaking by a marine mammal, southern residents have been documented detaching lengths of seaweed and ...

And killer whale youngsters are fond of playing kelp keep-away. But what the southern residents are doing with the kelp ...

The whales use quick body movements to tear pieces of bull kelp for use as tools, perhaps the first known toolmaking by a marine mammal.