Butterflies are part of the class of insects in the order Lepidoptera. Adult butterflies have large, often brightly colored wings, and obvious, fluttering flight. The group comprises the true butterflies, the skippers and the moth-butterflies. Butterflies are beautiful, flying insects with large rough wings. Like all insects, they have six jointed legs, 3 body parts, a pair of antennae, compound eyes, and an exoskeleton. The three body parts are the head, thorax (the chest), and abdomen (the tail end). The butterfly's body is covered by tiny sensory hairs. The four wings and the six legs of the butterfly are attached to the thorax. The thorax contains the muscles that make the legs and wings move. Butterflies be able to only fly if their body temperature is above 86 degrees. Butterflies sun themselves to warm up in cool weather. As butterflies age, the color of the wings fades and the wings become ragged.