18. Elephant Shark (Callorhinchus) Some elephant sharks have a venomous spine located near their dorsal fin. ©Totti / CC BY-SA 4.0 / Wikimedia Commons – Original / License ...

Dumbo octopuses live between 9,800 and 13,000 feet below the surface. These cute sea creatures only grow to about 8 inches tall, but the two fins on top of their heads make them stand out. They look ...