The olive sea snake is a long sea snake with smooth scales which are variable in their coloration. Most have olive skin along the back with pale, speckled skin along the sides. On the head the scales are a darker brown. Some individuals though are a flat olive-grey across the entire body.
They have the longest fangs of any sea snake.
As a snake they have no limbs. As sea snakes they are adapted for swimming with the body being slightly compressed and the tail is flat and oarlike.
They can grow to lengths in excess of 2m (6ft). Their weight may be up to 3kg (6.6lbs).
Olive sea snakes are carnivores. Their varied diet can include fish, eggs, crustaceans and molluscs.
Their prey is subdued using a potent venom. Once the venom is ingested they will coil around the prey and hold it till it stops wiggling. The venom of the olive sea snake works on the muscles and nerves of their prey and begins to break down prey from the inside to assist with digestion.
The venom is potentially lethal for humans if bitten.
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Olive sea snakes can be found in the waters along the northern coastline of Australia across towards New Guinea as well as other tropical areas in the south-west Pacific ocean. They range from the West Australian coastline around to Queensland.
They make their home around coral reefs estuaries and tropical shallows. They tend to be found in areas with a sea depth of 4-45m (13-147.6ft). They seem to favor more protected reef areas.
Breeding takes place from May to July.
The entire life cycle of the olive sea snake takes place underwater. Mating occurs under water and lasts long enough that they need to surface to breathe during. The female will swim to the surface dragging the male with her as they go.
Often several males will attempt to gain breeding rights with the same female.
Females give birth to live young underwater. They may have as many as 11 young though the average is 6. They will typically reproduce once every two years.
Young are darker in coloration than the adults and will lighten as they age.
Sexual maturity is reached at 3 years old for males and 5 years old for females.
The entire life of the olive sea snake is spent underwater. Storms sometimes wash them ashore and this is often fatal for the snake.
They can remain underwater for up to 2 hours before they need to surface to breathe.
Olive brown sea snakes have a venom which is used to subdue prey. They are inquisitive towards humans and sometimes bite people. These bites can be fatal.
Hunting tends to occur at night when they will emerge from their hiding places.
Olive sea snakes need to shed their skin throughout their life. This helps them to grow and removes barnacles and algae from the skin. This is achieved by rubbing against coral or rock. Shedding occurs every two to six weeks which is more often than land snakes.
Salt is excreted by a gland under the tongue to prevent excess salt accumulating in their body.
By Richard Ling – Flickr, CC BY-SA 2.0, https://commons.wikimedia.org/w/index.php?curid=1887136
Sylke Rohrlach from Sydney / CC BY-SA (https://creativecommons.org/licenses/by-sa/2.0)
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