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Fig. 2. Changes in oxygen consumption rate (means ± s.e.m., in multiples of
resting value) of double-crested cormorants after voluntary ingestion of a
single herring (mass 60 or 100 g) when resting in air at temperatures within
or below their thermoneutral zone (TNZ) (lower critical temperature
9°C). Sample sizes for the various conditions are indicated in
Table 1.