A humpback whale stays by the side of a whale entangled in fishing gear. He spent more than five hours by her side, swimming below her and raising her to the surface to breathe. Photograph By Dan ...

It made international headlines last year. What does a scientific dissection of the world's rarest whale involve?

Humpback whales are now migrating north to their warmer breeding waters — but some of them will give birth as far south as ...