|While there is no one simple answer to this question, butterflies and moths generally differ based on their overall habits and structure. Butterflies are typically active during the day (diurnal), while moths predominantly fly at night (nocturnal). Butterflies possess slender antennae that are clubbed at the end. Those of moths vary from long narrow filaments to broad fern-like structures. At rest, butterflies tend to hold their wings together vertically over the back. Moths rest with their wings extended flat out to the sides or folded alongside the body. Butterflies generally have long, smooth and slender bodies. The bodies of moths are often robust and hairy. Finally, most butterflies are typically brightly colored, while most moths tend to be dark and somewhat drab.