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Fig. 2. Deformations of the palato-maxillary arch during spitting. (A) Naja nigricollis immediately prior to spitting; note the deformation of the supralabial scales (arrow) caused by the frontal rotation of the maxilla; (B) a high-speed digital videograph recording of N. nigricollis spitting; note the ventral projections on the roof of the mouth (arrow). F, fang.