Orca Keeps Circling Boat, Then A Passenger Sees What’s On Its Back

Checking her theory

Tom paid closer attention and, after a while, could only agree with the passenger. When the orca drifted more than twenty meters or so from the hull, it turned and looped back, watching the boat. It was the same pattern, repeated. The animal would move forward, then return, as though checking that the boat was still there.