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[a500lbgorilla]

I guess it's UV vision plus an ability to ballpark the sun's position based on an internal clock.

[MadMojoMonkey]

I guess it's UV vision plus an ability to ballpark the sun's position based on an internal clock.

This said nothing about the statement that the hive is transparent to UV light.

Do you have a source on that? My preliminary search turned up that bees like dark hives, and will cover over any lights with propolis to get rid of the light.