clock shifting

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An experimental procedure in which homing pigeons are kept for some time in a light-proof room and exposed to periods of light and darkness that differ from those of natural light. The birds experience the same length of daylight as they would outdoors, but at a different time of day. When released, the birds are said to be ‘clock-shifted’ and fly in the direction that relates to the position of the sun predicted by their internal clocks, and not the sun's actual position.

Subjects: Zoology and Animal Sciences.

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