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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.