Butterflies vibrate their wings for an array of reasons: to regulate their temperature, to ward off predators, or to strengthen their wings. We learn so much about our environment when critters come Why do monarch butterflies shiver? They do this to increase their body temperature by warming their muscles so they can take flight. Photo Courtesy of Community Monarch Butterfly Garden Facebook I found a butterfly but it won't fly. It's not dead because it moves but it won't fly. What do I do? : r Butterflies How to Tell a Butterfly from a Moth Pollinators in Your Garden