UPDATE 1st June, 2018: We just set up snake_ID, a cool new page that simplifies snake identification. Be sure to check it out!

Hydrophis major

Olive headed sea snake

Venomous 💀💀💀💀 Very dangerous ref
Images provided by Flickr-/iNaturalist-API. Sporadic false assignments may occur.

Warning. 

The olive headed sea snake is said to be aggressive. Fatal bites had been caused by this snake. Keep in mind: Its bite is not painful. You can be bitten and envenomated without noticing it in time.
  • Snake Length

  • 42 cm - 156 cm ref
  • Dentition

  • front-fanged
  • Weight

  • ??? gr - 258 gr ref
  • D.movability

  • fixed
  • Pupil shape (closed state)

  • round (or oval) 
  • Teeth/Fang Length

  • 3.8 mm ref

Altitude range

Vertical distribution

-40 to 0 meter above sea level (a.s.l.)

Subspecies & Common Names


Hydrophis major  0 EN Common Sea Snake, Greater Sea Snake, Olive headed sea snake, FR Hydrophide Cercle

Full Taxonomy

  • I. Superfamily Colubroidea

  • Colubrids, elapids and vipers
  • II. Family Elapidae

  • Elapids
  • III. Subfamily Hydrophiinae

  • Sea snakes
  • IV. Genus Hydrophis

  • Sea snakes
  • V. Species Hydrophis major

  • Olive headed sea snake
  • VI. snakeID

  • 575