I was on Petit Jean river on a cold day, 35 degrees maybe, and I saw a hornets nest , so I wanted to take it home with me. I was trying to break it off when I heard a HMMMMMMMMM sound. I threw my motor in gear and took off and run as fast as I could when I heard them again as they pulled up beside me. Luckily they gave up and I went on. They will fly in cold weather.