Rhabdophis subminiatus (Red-Necked Keelback Snake)
Thai: (ngoo lay sab ko dang)
Length: Up to 130 cm (1.3 meters). Usually smaller than 1 meter.
Range: Thailand and southeast Asia.
Notes: These snakes are commonly found near water, lakes, ponds, and in gardens. Recently a friend had one in his swimming pool in Krabi town, southern Thailand.
Active Time? Daylight hours. I’ve found them sleeping around 1 foot off the ground in bushes.
Food: Frogs, toads, and fish primarily
Defensive Behavior: Spread out their neck slightly to make themselves appear bigger. Not as dramatic as a cobra. Lift their head and neck off the ground 4-5 inches.
Venom Toxicity: LD50 is 1.29 mg/kg for intravenous injection (source). That is about the same rating as the very deadly “Banded Krait (Bungarus fasciatus)”. It was previously thought these snakes were harmless. Some kept them as pets and were bitten. In one case the snake was left to bite for two entire minutes before removing it from a finger. Serious complications resulted requiring hospitalization and intensive care. Click for article. These snakes are rear-fanged and need to bite and hold on, or, repeatedly bite to have any effect on humans. Once they do either – there is the possibility of severe problems including renal failure and death. Recently a small boy of 12 years old was bitten by one he was keeping as a pet in Phuket, Thailand and he is currently being treated (11/5/10). Be very careful not be be bitten by these snakes. There is NO ANTI-VENIN available yet for these snakes.
Another study in Japan ranked the venom as having an LD50 of 1.25 mg/kg for intravenous injection. (Japan Snake Institute, Hon-machi, Yabuzuka, Nitta-gun, Gunma-ken, Japan) V.1- 1969- Volume(issue)
Update: The 12 year old boy bitten by the Rhabdophis subminiatus was treated for 2 weeks of intensive care, and released. He was bitten multiple times, the 2nd bite lasting over 20 seconds.
Offspring: I have a juvenile red-necked keelback I’ve taken photos and videos of and will release in the wild tomorrow morning. I cannot find anything much about offspring.
Notes: These snakes can inflict a deadly bite when they are allowed to bite for longer than a couple of seconds. I know personally of two instances where a child was bitten for well over 20 seconds, and a man was bitten for about a minute. Neither wanted to hurt the snake to remove it forcibly, and both spent over a week in intensive care, with the possibility of renal failure and death. Do not play with these snakes. If you have one, do not free-handle it. Treat it like you would a pit viper or a cobra. The LD50 on this snake for intravenous was stated to be 1.29 mg/kg. That is VERY venomous.
As a precaution, any snake in the Rhabdophis genus should be treated with extreme caution.
Species: Rhabdophis subminiatus
Red Necked Keelback video
Red Neck Keelback Snake video – This is another red-necked keelback (adult) that I had for a while. I’ve since let it go back into the wild.