wolves howl to communicate in there pack. but if they don't have a pack, and they howl, its a loners howl wanting a mate. they also howl to gather the pack to its leader, or the leader is giving out commands. they also howl jsut for fun.
Wolves dont actually howl at the moon like most people think..wolves are nocturnal which means they're awake during the day (sometimes at day too) so they are just more active at night. (and howling...