“…Even naive young of many species spontaneously attack crickets, for example, grasshopper mice (Onychomys leucogaster and O. torridus; Baxter, 1979;Boice & Schmeck, 1968;Cyr, 1972;Langley, 1981Langley, , 1983, golden hamsters (Mesocricetus auratus; Polsky, 1975Polsky, , 1977aPolsky, , 1977bPolsky, , 1977cPolsky, , 1978aPolsky, , 1978b, Mongolian gerbils (Meriones unguiculatus; C. G. L. Brack, 1981), and laboratory mice (Mus musculus; Butler, 1973;Thomas, 1969;Whelton & O'Boyle, 1977). Further, in nearly all these cases predatory behavior showed marked increases in efficiency and stereotypy of damage location with experience.…”