An elegant deduction

I read somewhere today that the great gray owl and northern hawk owl, who normally inhabit areas hear the Arctic circle, are diurnal because, for several months out of the year, THERE IS NO ALTERNATIVE!!! There is 24 hour sunlight. So they adapt to hunting during daylight hours, or at least the crepuscular hours (before and after sunrise and sunset) because that is the conditions under which they live. Makes perfect sense to me, and it's one of those moments where"jeeze why didn't I think of that!"