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Predation on adult microhylid frogs    Kaloula   pulchra    by two closely-related colubrid snakes is described, based on two observations of    Oligodon   formosanus    in Hong Kong and one observation of    O.   fasciolatus    in Thailand. In two instances,    O.   formosanus    was observed cutting open the abdomen of this anuran species. In one case, it performed repeated rotations about its own longitudinal body axis (“death roll”) while its head was inserted into the frog’s abdomen. The purpose of this behaviour was probably to tear off organs and swallow them. Once    O.   fasciolatus    was observed catching and swallowing    K.   pulchra    whole. In that case, the snake also made a series of rotations while it maintained its firm grip in the frog’s belly. It is concluded that, for these two closely-related kukri snakes, prey size is crucial for determining whether the gape width allows large preys to be swallowed entire.

herpetozoa

Gruesome twosome kukri rippers:    Oligodon   formosanus    (Günther, 1872) and    O.   fasciolatus    (Günther, 1864) eat    Kaloula   pulchra    Gray, 1831 either by eviscerating or swallowing whole