It's just a myth. Wolves don't howl at the moon. Scientists have found that wolves howl when they are most active. This is mostly at night and in the early morning
The howling myth goes back to the days when people didn't have electricity. If the moon was full, the night would be bright enough for farmers to work outside. And once outside, they were able to hear the wolves howling.A wolf's howl can be heard up to four miles away - but the sound carrie best in open spaces. So if the farmers were inside, they'd be less likely to hear the noise, says 3-2-1 Contact magazine.
What is a howl? To a wolf, it can mean many things. a howl might be a wolf's way of saying: "Hey, bub, this is my land. Stay away." A howl might be the pack's alarm clock in the morning. It can also be a way to call stray wolvesback to the pack. And that's about the "howl" er, whole of it!