Date: Winter 2011-2012
Why do wolves howl at the moon?
They don't. Wolves howl mostly as communication between members of a pack, to help keep the pack in contact at distance. They have a sophisticated social structure and use a lot of different vocalizations to communicate. I don't think the moon makes any difference to them at all, its just an entertaining old story.
This short article that includes sound files may be of interest
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Update: June 2012