In 1867, off the coast of Chile, zoologist Enrico Giglioli spotted a whale with two dorsal fins, a feature unheard of in any known whale.

A similar whale was spotted off Scotland in 1868, and another more than a century later near Corsica.

If “Giglioli’s whale” exists, it’s been spotted only three times, and no specimen, living or dead, and has ever been captured.

See also MacFarlane’s Bear.