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{=Porthiclimn) nwnmifer in which individuals "tend to jump, either when they hit a prey or to clear a height of up to 3 ft (1 m), starting from a low point [emphasis added]." Certainly A. nummifer may jump; however, in their decades of experience with hundreds of these snakes in both the wild and captivity, W. Lamar, L. Porras, and A. Solorzano have never seen nor heard of this behavior (personal communication). It is possible that A. nwnmifer may appear to jump as they strike from an arboreal perch (i.e., a log) and fall to the ground (L. Porras personal communication). The best reports of ophidian saltation are those of Gans and Mendelssohn (1971) and Gans (1974). These authors analyzed Bitis caudalis jumping behavior in terms of stimulus and biomechanics. They determined that B. caudalis weighing less than 23.5 g, with a body temperature between 31 °C and 37 °C, were able to jump using sidewinding locomotion. This type of saltation is energetically expen-

Saltation in snakes with a note on escape saltation in a Crotalus scutulatus