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Gerard's water snake or the cat-eyed water snake (Gerarda prevostiana) is a species of water snake found in Asia.


They feed almost exclusively on crabs, which they tear into bite-sized pieces by pulling them through their coils, in contrast to most other snakes which swallow their prey whole.[1]


Frontal a little longer than broad, shorter than its distance from the end of the snout, or than the parietals; loreal slightly longer than deep, a little smaller than the nasal; one pre- and two post-oculars; temporals 1+2; upper labials 8, fourth entering the eye; 4 lower labials in contact with the anterior chin-shields, which are much larger than the posterior. Scales in 17 rows. Ventrals 146–158; anal divided; subcaudals 31–34. Uniform dark olive above; three outer rows of scales whitish; upper lip white, rostral dark olive; ventrals and subcaudals whitish, with dark edges.[2]

Total length 41 cm (16 inches); tail 5 cm (2 inches).


India, Myanmar (= Burma), Sri Lanka, Thailand, Philippine Islands (?), Bangladesh, west Malaysia, and Singapore


  1. Jayne, B. C., Voris, H. K. & Ng, P. K. L. 2002 Snake circumvents constraints on prey size. Nature 418: 143
  2. Boulenger, G. A. 1890. Fauna of British India. Reptilia and Batrachia. Taylor & Francis, London. p. 379


External linksEdit

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