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Fig. 3. Values for the limit of supercooling for individual painted turtles
collected at our field site in north-central Nebraska in September (four
hatchlings from each of three clutches) and November (four hatchlings from
each of four clutches). The turtles were placed into the experimental protocol
the day after they were removed from the nests in which they completed
incubation and hatched. The distribution of values for animals studied in
September differs from that for turtles studied in November (Wilcoxon
two-sample test, z=3.86, P<0.001). Data are from Packard
et al. (2001).