SEAVR 2019: 044‐045
ISSN: 2424‐8525
Date of publication: 10 April 2019
Hosted online by ecologyasia.com

King Cobra Ophiophagus hannah predation on Palawan Water Monitor
Varanus palawanensis in the Philippines
Emerson Y. SY & Bianca Kaye C. ONG
emersonsy@gmail.com (Sy)Observers: Bianca Kaye C. Ong, Thidy Simeon.
Photograph by: Bianca Kaye C. Ong.
Subjects identified by: Emerson Y. Sy.
Location: Miniloc Island, Barangay Bebeladan, Municipality of El Nido, Palawan Province, Philippines.
Elevation: 7 metres.
Habitat: Beach resort, near limestone forest.
Date and time: 19 July 2018, 13:00 hrs.
Identity of subjects:i) King Cobra, Ophiophagus hannah (Reptilia: Squamata: Elapidae).
ii) Palawan Water Monitor, Varanus palawanensis (Reptilia: Squamata: Varanidae).
Description of record: A snake was observed on the roof of a hut, in the process of attempting to swallow amonitor lizard head first. Both animals were seen to fall six metres into shallow water (Fig. 1), probably as a resultof a struggle. Whilst latched on to the lizard’s head, the snake slithered backwards toward the seawall. The area
has high foot traffic, and the resort staff decided to intervene. While being captured the snake regurgitated thelizard, before being relocated to an area with minimal human presence.

Fig. 1.

© Bianca Kaye C. Ong

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Remarks: The snake was identified as Ophiophagus hannah based on (i) dorsal body colour is olive brown, (ii)large parietal and occipital scales, (iii) loreal scale is absent, (iv) one preocular, and (v) three postoculars (Taylor,1922).
After being released from the grip of the cobra, the lizard was identified as Varanus palawanensis based on (i)head colour is predominantly black, (ii) an off‐white temporal stripe, (iii) throat is off‐white with black spots, (iv)enlarged nuchal scales and (v) dorsal colour is mainly black with some yellowish scales on the body, limbs, and tail(Koch et al., 2010).
The King Cobra is a species complex with widespread distribution from South Asia to Southeast Asia (Das, 2002).
In the Philippines, King Cobra has been documented previously on several small and large islands (Sy & Wallbank,2013; Sy & Dichaves, 2017; Sy & Tabayag, 2018).
The Palawan Water Monitor is endemic to the Palawan faunal region and occurs on the following islands:
Balabac, Busuanga, Calauit, Candaraman, Coron, Lagen, Malapina, Palawan, Sibutu (Koch et al., 2010). Varanus
palawanensis is the second Philippine monitor lizard known to be predated by this well‐known ophiophagous
snake. This paper provides the first distributional record for both species on Miniloc Island.
References:Das, I. (2002). A photographic guide to snakes and other reptiles of India. New Holland Publishers (UK) Ltd.
London, United Kingdom. 144 pp.
Koch, A., Gaulke, M. & Böhme, W. (2010). Unravelling the underestimated diversity of Philippine water monitor
lizards (Squamata: Varanus salvator complex), with the description of two new species and a new subspecies.
Zootaxa 2446: 1‐54.
Sy, E.Y. & Dichaves, J. A. L. (2017). Geographic distribution: Ophiophagus hannah (King Cobra): Philippines,
Pangulasian Island. Herpetological Review 48(3): 591.
Sy, E.Y. & Tabayag, E.A. (2018). First record of King Cobra and Leviton’s Bronzeback (Dendrelaphis levitoni) on
North Guntao Island, Palawan Province, Philippines. Southeast Asia Vertebrate Records 2018: 48‐49.
Sy, E.Y. & Wallbank, M. (2013). Geographic distribution: Ophiophagus hannah (King Cobra): Philippines, Romblon
Province. Herpetological Review 44(1): 110.
Taylor, E.H. (1922). The Snakes of The Philippine Islands. Department of Agriculture and Natural Resources andBureau of Science, Manila. 312 pp. + 37 plates.

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