A Turtle or a Sea Snake?

Like other sea snakes, the turtle-headed sea snake (Emydocephalus annulatus) has fangs and venom. But its venom is weak so, instead of defending with a bite, the species tends to react to danger by swimming back to a crack or crevice to hide. For food, the sea snake sneaks around coral reefs looking for fish eggs attached to coral or rocks. It then uses a large tooth-like scale on each side of its upper lip to scrape the eggs off of their home base. 

The head of a turtle-headed sea snake.

Flickr user PacificKlaus