These humpback whales have already covered thousands of kilometers on their migration from tropical breeding grounds to colder feeding grounds.
But one of these whales is about to take a detour.
From several kilometers away, it hears a group of orcas harassing a seal.
And as if answering a distress signal, it races off.
The humpback charges the 8-meter-long orcas, driving them away with its massive pectoral flutes.
Then, when the threat is gone, it swiftly returns to its journey.
Humpbacks are known to mount these kinds of impromptu rescue missions.
But why would they expend time and energy risking their lives for a stray seal?
Isn't nature a cruel and vicious place without room for generosity?
Well, sort of.
