Fig. 3. Energy intake (kJday^-1) and organ masses of deer mice from two different altitudes and either warm (open columns) or cold (filled columns) temperatures. Within a single column color, letters that are different from each other indicate differences if they are statistically significant with respect to altitude. Asterisks indicate statistical differences between temperatures. Values are means +1 S.E.M. (N as in text). Note that the data on organ mass are for the intact (with blood) mice only.