The majority of coral in the world lives off photosynthetic algae, but the Carnivorous Coral, which generally lives within 60 meters of the surface, is a little known species that is completely carnivorous. They digest their prey with chemicals.
The Tonguefish is an odd little fish that lives within the estuaries of tropical oceans. Some of the species have been witnessed swimming around the hydrothermal vents deep under the ocean. They are bottom-dwelling fish with eyes on only one side of their head.