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Fig. 2. Rate of oxygen consumption during rest and activity by sea otters. Height
of each bar represents the mean value for each behavioral state; vertical
lines denote + 1 s.d. Numbers in parentheses indicate sample sizes. Note that
foraging and grooming oxygen consumption rates were measured in post-prandial
otters. The remaining rates were measured in post-absorptive otters. All rates
measured in this study were statistically different (see text). Data
represented by gray bars are from Williams
(Williams, 1989) and were not
included in statistical comparisons.