Fig.1. There are two recognised subspecies. a) B. f. flaviceps, which is found across the species' range. b) B. f. baluensis, a lower montane variety that appears to be limited to Sabah, Malaysian Borneo. They can be differentiated by the head colour, which is bright red on B. f. flaviceps and a more yellow colour on B. f. baluensis. The B. f. baluensis has a more extensive red colouration on the lower body and interspersed with black and white bands, while the B. f. flaviceps lacks black and white bands (Das, 2015).
(Copyright © Teo Eng Wah & Nicholas)Malaysian venomous terrestrial snake species are classified into three families: Viperinae (pit vipers), Natricidae (some keelbacks) and Elapidae (cobras, corals, and kraits). Bungarus flaviceps, commonly known as Red-headed Krait, is one of the venomous snakes in the Elapidae family (Fig.1). In Malay, this species is called “Ular Katam Tebu Kepala Merah” due to its distinctive physical features: a bluish-black body contrasted with a brilliant red head, neck and tail with a white belly (Das et al., 2015).
The Red-headed Krait inhabits forested lowlands, hills and lower montane areas below 900 metres elevation (Das, 2015; Ecology Asia, 2026). It is widely distributed across Southeast Asia, from southern Myanmar and Thailand south to Borneo and Java (Das, 2015). It can be found in Brunei, Kalimantan, Sumatra, Java, Malaysia, Myanmar, Singapore, Thailand and Vietnam (Grismer & Chan-Ard, 2012). According to IUCN Red List of Threatened Species, this species is categorised as Least Concern as it has a widespread distribution and is present in many protected areas (Grismer & Chan-Ard, 2012).
Being nocturnal, this carnivorous species is more active at night and mainly hunts other snakes and lizards such as skinks (Das, 2015; Ismail et al., 2022). It is an oviparous species (reproduces by laying eggs). The juvenile of Bungarus flaviceps has a red head characteristic with a pointed, elongated black mark extending from the nape along the interparietal suture to the frontal shield. The body is iridescent black or bluish black but becomes red at the anterior all the way to the tail where it is entirely red. There is a white line of small white dots that extends from the nape along the vertebral ridge to the red area anterior to the tail which is barely visible in the red area anterior to the tail and does not appear on the tail. There is also a relatively solid white line extending along the first two or three rows of dorsal body scales from just behind the neck to the red region in front of the tail (Chanhome, 2013).
The red-headed krait possesses a lethal cocktail of neurotoxins, primarily dominated by phospholipases A2(PLA2) and three-finger toxins (3FTx) (Tan et al., 2022). The other components include bungarotoxins (pre-synaptic), flavitoxin (post-synaptic), Kunitz-type serine protease inhibitors, metalloproteinases, and acetylcholinesterase. It is highly potent, causing muscle paralysis and with toxicity comparable to the Malayan Krait (B. candidus).
For a krait bite, immediate hospitalisation is the only definitive treatment because the venom contains potent neurotoxins that can lead to rapid respiratory failure and death. First aid must focus on slowing the spread of venom through the lymphatic system and maintaining the airway (Fig. 2).
There is currently no dedicated (monospecific) antivenom for the red-headed krait. Malaysia does not produce its own antivenom. Treatment of systemic envenomation relies on cross-reactivity with other krait antivenoms, produced primarily by the Thailand Red Cross and the Queen Saovabha Memorial Institute (QSMI) (Blessmann et al., 2024). Timely administration of the QSMI Bungarus candidus (Malayan Krait) antivenom is the most effective for Red-headed Krait bites, being roughly 13 times more potent at neutralising its venom than other krait antivenoms. To date, there are no reports of death from a B. flaviceps bite in Malaysia.
Fig. 2. The essential first aid for krait bite and the don’ts.
(Copyright © Ahmad Khaldun Ismail)