On 12/08/2017 08:33 AM, randy oliver wrote:
> The most puzzling to me is the cue for midwinter initiation of
> broodrearing, during the period when day length is at its shortest (or
> absent), photoperiod change is minimal (or absent), temperature is
> consistently low, and there is no incoming pollen or nectar.
>
Maybe they don't measure the length of the day but look at the location
at the horizon where the sun rises.
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