Where do whale sharks mate? The search to learn where the magic happens for the world's biggest fish

Whale Sharks Mating - (Flora Tomlinson-Pilley)

Whale sharks shouldn't be hard for scientists to find. They are enormous — they are the biggest fish in the sea and perhaps the biggest fish to have ever lived. They are found in warm oceans all around the world. By shark standards, they are slow swimmers.

But they somehow manage to also be very private: Scientists don't know where they mate, and they've never observed it before.