Date: 12/17/25 1:04 pm From: Tom Roberts <troberts2459...> Subject: Light intensity and roosting - Somerset County
I have observed - and it finally occurred to me - that roosting appears driven by a light intensity ( W/M2 (watt/meter2)). Trying to correlate to a monitor on our local weather station - I observe birds becoming active in morning and then maybe heading to roost by about 90ish?W/M2
This all makes sense as I've read observations of birds and creatures settling down during full eclipses. Haven't seen it personally as I'm watching the astronomical event.
In the winter, especially on overcast days, the light decreases quicker so, they head to roost a bit earlier.
Is there any quantified research on the INTENSITY of light that triggers the behavior. Similarly, is there any research that a decreasing RATE triggers behavior ( low sun angle on over cast days or eclipses)
