Butterflies are beautiful, flying insects with large scaly 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, and abdomen. 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 are very good fliers. They have two pairs of large wings covered with colorful, iridescent scales in overlapping rows. Lepidoptera are the only insects that have scaly wings. The wings are attached to the butterfly's thorax. Veins support the delicate wings and nourish them with blood. Butterflies can 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. The speed varies among butterfly species. The fastest butterflies can fly at about 30 mile per hour or faster. Slow flying butterflies fly about 5 mph. Butterflies and moths can only sip liquid food using a tube-like proboscis, which is a long, flexible "tongue." This proboscis uncoils to sip food, and coils up again into a spiral when not in use. Most butterflies live on nectar from flowers. Some butterflies sip the liquid from rotting fruits and a rare few prefer rotting animal flesh or animal fluids