Abstract
The tendency to climb was examined in a laboratory study of 11 species of muroid rodents {Peromyscus gossypinus, P. tnaniculMus b air di, P. eremicus, P. polionotus, P. leucopus, Microtus canicaudus, M. montanus, M. ochrogaster, M. pennsylvanicus, Rhabdomys pumilio and Mus musculus). Differences among species were found, with species such as P. gossypinus, P. maniculatus and Mus musculus spending approximately one-third to one-half of their time off the ground and R. pumilio, Microtus pennsylvanicus and M. ochrogaster displaying virtually no climbing. Although the performance of some species was consistent with reports of their behavior in the field, several exceptions were noted. Significant positive correlations were found between time spent off the ground in the present study and the hind foot length ratio, number of square entries in the open field, and the amount of jumping in the open field as found in previous laboratory studies.
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