The first known sighting of a two headed porpoise happened in the North Sea when two fishermen pulled in their net. The already deceased symmetrical conjoined twins were photographed but thrown back into sea by the fisherman fearing legal prosecution for accidentally catching the creature in their beamtrawl nets.
Two-Headed Porpoise Found For First Time
Fished from a trawl net, Dutch fisherman stumbled upon the extremely rare catch in the North Sea.
"While case studies of conjoined twins have been studied in humans, reptiles, and domestic animals, they are rarely seen in wild mammals. In fact, before this find, only nine other instances of two-headed cetaceans of any kind had ever been reliably documented."