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 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 How to Tell a Butterfly from a Moth Pollinators in Your Garden 5 Basic Butterfly Behaviors to Know Birds and Blooms What causes shaking in monarch butterflies?