Neckshot hit the nail on the head, not enough heat in the sun to make things grow, so they conserve their energy and stay warm, to high an altitude means a lot colder (need more food to keep warm) valley floors- same thing (a lot colder on the valley floor after a good frost) so the warmest places are about the middle of a hill face, easier to divide it into thirds, top third of hill- cold, bottom third- cold and the middle third is the warmest, this is only a rough guide for when the weather is cold and miserable, they will drift up and down to catch the sun.
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