First seen in 1999 and then videoed in 2009, this cute animal (for an octopus, anyway) can live as deep as 7,000 metres below the surface, making it the deepest-dwelling octopus species on record. Named for the flaps on either side of its bell-shaped head, this group of animals – there may be as many as 37 species – never sees the sunlight. The dumbo octopus can hover above the seabed with a type of siphon-based jet propulsion, where it feeds off of the snails, bivalves, crustaceans and copepods that live there.