Fig. 2. Body mass of little brown myotis, Myotis lucifugus, in an abandoned limestone mine in western Ohio on three dates during winter 2006–2007. Each pair of box-plots represents the mass of bats weighed in two sections of the mine, a cold section near the front of the mine (C) and a warmer section deeper in the mine (W). Sample sizes are under the box-plot. In all samples, bats from the warmer section were larger than those from the colder section. Significance level of one-tailed t-tests indicated by: ^*P<0.05; ^**P<0.01.