Reptiles
Olive Sea Snake
Aipysurus laevis · also called olive sea snakes
An olive sea snake glides between coral formations, propelled by a flattened, paddle-shaped tail, in water it will never actually leave, having given up the last remaining ties to land that most of its snake relatives still depend on.
Overview
The olive sea snake, Aipysurus laevis, is a fully marine reptile native to coral reef habitat across the Indo-Pacific region, including Australian waters. Its complete independence from land, live-bearing reproduction at sea, and skin-based supplemental breathing make it one of the more thoroughly aquatic reptiles found anywhere in the world.
A snake that has entirely let go of land
While most snakes retain at least some connection to solid ground, the olive sea snake has severed that link completely, spending every stage of its life, from birth onward, fully submerged in open water.
Status
Least Concern — widespread and stable across suitable coral reef habitat throughout the Indo-Pacific region.
Olive Sea Snake: common questions
Can the olive sea snake survive on land at all?
No, the olive sea snake is fully marine and never comes onto land at any point in its life, including for reproduction, since it gives birth to fully formed live young directly in the water rather than needing to return to shore to lay eggs the way most other snake species must.
How does the olive sea snake breathe during long dives?
An olive sea snake can absorb a meaningful amount of additional oxygen directly through its skin while submerged, a capability that helps extend the length of its dives beyond what its lung capacity alone would otherwise allow, letting it forage for longer stretches before needing to surface.
Is the olive sea snake dangerous to divers?
Despite carrying potent venom, the olive sea snake is generally docile and even curious toward divers, and bites to humans are rare, usually occurring only when the snake is accidentally touched or deliberately handled rather than through any unprovoked aggression.
Where does the olive sea snake live?
The olive sea snake is native to coral reef and coastal habitat across the Indo-Pacific region, including the waters around Australia, spending its entire life in the ocean without ever needing to come ashore.