Migration graphic (IMAGE)
Caption
Elevational ascent of a Giant Hummingbird, illustrated by high-resolution Argos satellite tracking data. During a period of 21 days, the bird showed bursts of ascent interspersed with pauses and even slight downward movements. The bird stopped at mid-elevations to acclimatize before ascending the high peaks of the Andes.
Credit
Graphic: Jessie Williamson.
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