Sea snakes are amongst the most venomous of the world’s snakes, and are highly adapted to life at sea, being the most completely marine of all reptiles and never voluntarily coming ashore (3) (4) (5). All possess a flattened, paddle-like tail for swimming, as well as valved nostrils, which can be closed when the snake is underwater. Sea snakes lack the expanded belly scales that most other snakes use for moving on land (2) (3) (4). The body of the annulated sea snake (Hydrophis cyanocinctus) is variable in colouration, but usually bears 50 to 75 black bands or rings on a ...
