Density-dependent foraging strategy of a large carnivorous lizard, the savanna monitor (Varanus albigularis).

Captive, subadult white-throated savanna monitor lizards (Varanus albigularis; n?=?15) were tested in a prey density-dependent foraging experiment. Within a test arena individual lizards were offered 10 large and 10 small snails in both a large and small circular area. Results showed that at high prey density, these lizards selected large over small snails. At low prey densities, however, large and small snails were selected at an equal rate. Apparently, when prey densities are high, the lizards have the opportunity to select the larger prey items without incurring locomotor costs. These data support optimal foraging theory but are unique in that they are an example from a little-studied, widely foraging species of lizard. (PsycINFO Database Record (c) 2010 APA, all rights reserved)