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Ridley’s Racer – Cave Snake – Not Venomous

Cave snake - Ridleys Racer - Othriophis taeniurus ridleyi - Thailand
Othriophis taeniurus ridleyi. Ridleys Racer. Non-venomous. Lives in caves, eats bats.

Othriophis taeniurus ridleyi (Ridley’s Racer)

Length: up to 2.5 meters. I have caught eight of these snakes, all of them under 2.25 meters.

Range: Chumpon, Thailand, south to border of Thailand-Malaysia

Habitat: Usually caves, though at times found outside caves. Recently I found a number of them in a bungalow at a nature resort and an empty wooden cabin in a rubber plantation. Then someone wrote me to ID one that was climbing around the limestone cliffs in Krabi.

Active Time? The snake is mainly nocturnal. They are active during the day only after heavy rainfall, or inside caves.

Food: Bats, birds, and maybe even rats if they happened to be on the ground.

Defensive Behavior: These Thailand snakes are calm and move slowly unless provoked substantially.

Venom Toxicity: None. Member of rat snake group – so their saliva probably contains venom, but they have no venom injecting fangs in the front or rear. They have rows of teeth in the upper jaw, but very small – less than 1/4th inch long.

Offspring: Nothing known – still updating this article.

Notes: These are often found in Thailand caves, they are excellent wall climbers. A Buddhist monk walked me through some pitch black caves at a temple with a cave in Southern Thailand and showed me this amazingly colored Ridley’s Racer pictured above. This non-venomous snake, part of the rat snake family was calm and let me take video with the camera just 12 inches from her head. Ridley racer snakes hang on cave walls and snatch flying bats out of the air.


Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Serpentes
Family: Colubridae
Subfamily: Colubrinae
Genus: Othriophis
Species: taeniurus ridleyi

Ridley’s Racer Snakes Video:

Here is another video taken by a visitor from France that was climbing a mountain at a local Buddhist temple and saw this snake during the daytime cruising the limestone rocks:


Snake posts by Vern Lovic. Amateur herpetologist roaming about Thailand on field herping tours and events to find king cobras, kraits, vipers, corals, keelbacks, and other snakes native to Thailand. FYI - Thailand has over 200 snake species. Here's our latest book with detailed information on Thailand's 35 Deadly Snakes. "Is That Snake In Your House Dangerous? Identify Deadly Thailand Snakes In Under 5 Minutes!" INFO HERE.

7 thoughts on “Ridley’s Racer – Cave Snake – Not Venomous

  • at 4:05 am

    a snake in the garden……..length-50 cms….diam–1-2cms
    looked all one colour grey to black…
    what was it I am in Koh Samui Thailand

    • at 4:09 am

      Hi Peter… I’m not that good. You’ll have to get a photo. At half a meter it could be juvenile and the snakes change in appearance as they develop. Could be MANY different types with that description.

  • at 8:30 pm

    There was a snake on my front porch the other day. I was out of country on business; my wife thought it was a cobra because it reared its head about a foot from the ground and had a small hood. The snake was cornered by my huskies and then removed by my staff; my wife said that the snake went for one of the huskies but i think if it had been a cobra the husky would have been in trouble. it was about 1.5m in length and “black” (according to a thai which basically means any dark colour)this snake had a barely visibly green line from head to tail. My staff said these snakes are quite common in the moo baan (Muang Ake project, Pathum Thani) We are next to a small lake that contains several water monitors. I am curious to know if you have an idea of what this snake was and also if there are cobras or Kings in this area? as it would present considerable danger to the dogs. many thanks.


  • at 6:37 pm

    I have seen Ridleys racers several times in caves in northern Thailand – Tham Tub Tao, 40 km north of Chiang Dao, Chiang Mai province. Very definitely this snake – about 1 – 2 metres. I am a Biology teacher!
    Thought you might be interested that they are NOT only found south of Chumphon.

    • at 7:53 pm

      Possible, the ranges in books are not set in stone. There is another rat snake that is in the far north that resembles the Ridley’s racer. I don’t remember where I saw the range info. Cheers

      • at 6:24 am

        Last month I went to Mae Lana Cave in the extreme north-west of Thailand, and saw what I’m pretty sure was a Ridley’s racer, well inside the cave in complete darkness. I have some photos (not very good, taken with my phone in a waterproof bag) – if you want to email me I could send them to you.

        • at 12:11 pm

          Yes, email to me – I always like to get photos! Cheers David


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