High speed airships are probably a better architecture for this application than n-copters. There are remove controlled airships that can do 30 mph and they don't need to expend energy to stay aloft. They also won't fall like a rock out of the sky, so long as their gasbags haven't been punctured.

https://www.youtube.com/watch?v=4ecSXRK9ZPk

Depending on the frequency of the wolf-call, speakers to produce them and their power system could be made quite light.