Can you tell a venomous aquatic creature from a non-venomous one? Test your knowledge of some of the world’s most dangerous underwater animals here. Most people, when asked, are able to name a few ...

The Olive sea snake has special valves in its nose to keep water out while its swimming.© DNC40/Shutterstock.com Sea snakes are among the most venomous reptiles on the planet, having evolved powerful ...

With venom more toxic than a cobra's, a banded sea krait could kill a human with a single bite, but the good-natured sea snakes are unlikely to attack. From the Show ...