... an increase in the number of littersproduced or by an increase in the duration of the time betweenconception to weaning. Examination of the data on squirrelsindicates that longer breeding ... lengths.Sciurinae.—Comparing the 2 subgroups of the subfamilySciurinae (Sciurini, tree squirrels; Pteromyini, flying squirrels)allows investigation of the in uence of a highly specializedmode of locomotion (gliding) ... (2002—Pteromyini). Analysiswas across 8 taxa: Callosciurinae, Ratufinae, Sciurillinae,Sciurinae: Pteromyini, Sciurinae: Sciurini, Xerinae: Marmotini,Xerinae: Protoxerini, and Xerinae: Xerini. I use the...