Butterflies Behaving Badly: What They Don't Want You to Know National Geographic Why does my butterfly keep hanging upside down and vibrate? Ever notice a monarch butterfly vibrating its wings? This isn't just random behaviorit's a survival strategy called Shivering. Especially when temperatures drop, monarchs vibrate their wings to generate heat and warm 16 Purple Butterfly Meanings: What Do They Symbolize? UniGuide Butterfly Love Birds and Blooms Fun fact about moths, have you ever wondered why they vibrate their wings? Moths heat up their flight muscles by vibrating their wings, since they do not have the radiant energy of the sun (being