When you see a tiny winged creature flutter by, how can you tell if it’s a butterfly or a moth? Butterflies are active during the day, while moths are usually nocturnal. Butterflies have slim bodies, while moths are fat and hairy. When a butterfly lands, it rests with wings closed; moths rest with their wings open. Butterflies have antennae that are shaped like mini golf clubs; the antennae of moths are either feathery or straight.