How does a male humpback whale (also called a “bull”) ensure the survival of his species, if the females copulate with several other males, and go out and about through great distances in the ocean?

Between July and October, the warm waters of the Costa Rican South Pacific welcome some very special visitors: humpback whales.

Hundreds of them migrate from Antarctica on a huge 18,000-kilometer (over 11,000 miles) journey, and look for a safe place to mate or give birth to their calves. The reasons for this migration are unknown, and there are still more questions than answers. Read more