A "super-group" of humpback whales observed from an aircraft off the coast of Cape Peninsula, South Africa. PHOTOGRAPH COURTESY JEAN TRESFON

A "super-group" of humpback whales observed from an aircraft off the coast of Cape Peninsula, South Africa. PHOTOGRAPH COURTESY JEAN TRESFON

Why are all of these humpback whales all suddenly hanging out? No one really knows.

In a new study, scientists report spotting as many as 200 humpbacks at a time gathering off South Africa. That's bizarre for a species previously believed to be loners.

View the full article on National Geographic.