Migration: Figure 25 (a) Rufous hummingbird. (b) Torpor in hummingbirds: oxygen consumption (red line) is high when hummingbirds are active during the day but may drop to one-twentieth of these levels at night.

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Migration

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Figure 25 (a) Rufous hummingbird. (b) Torpor in hummingbirds: oxygen consumption (red line) is high when hummingbirds are active during the day but may drop to one-twentieth of these levels at night.

4.1 Thermoregulation in migratory birds

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