Blanket octopus pairs are some of the undersea world ... a modified arm that holds its sperm—and gives it to the female, who keeps it in the mantle cavity until needed for fertilization.

This female blanket octopus was between 35cm and 40cm in size. Photo: Christiaan Stopforth/Drone Fanatics SA Photographer and videographer Christiaan Stopforth had an extraordinary encounter with ...