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.