Natural daylight restricted to twilights delays the timing of testicular regression but does not affect the timing of the daily activity rhythm of the house sparrow (Passer domesticus)

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Trivedi, Amit K; Rani, Sangeeta; Kumar, Vinod;

<p>Abstract</p> <p>Background</p> <p>A stable and systematic daily change in light levels at dawn and dusk provides the most reliable indicator of the phase of the day. It is likely that organisms have evolved mechanisms to use these twilight transitions as the primary ... View more
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