36. The Frilled Shark (Chlamydoselachus anguineus)
Dubbed a ‘living fossil’, the Frilled Shark was recently filmed at previously uncharted depths, offering new insights into its mysterious existence. With a long, snake-like body and distinctive frilled gills, this ancient predator closely resembles its prehistoric ancestors. Its eerie, undulating movement and rarity make every sighting a notable event. Discover more about this fascinating relic at Live Science.