How to Tell the Difference Between Butterflies and Moths

Moths and butterflies come from the insect family Lepidoptera and are some of the most beautiful and interesting insects. Over 95 percent of Lepidoptera is made up of moths. There are many ways to differentiate moths from butterflies, though the best way would be to speak to an entomologist since there are exceptions to the following steps.

Difficulty: Easy

Instructions

1. Notice the antennae. A butterfly's antenna is long and skinny and ends with spheres (clubs). A moth's antenna is feathered or long and skinny and do not end in clubs. Basically, if you notice feathered antenna, you know that you're studying a moth.

2. Pay attention to the time of day. Moths are nocturnal, while butterflies aren't. Moths also tend to be attracted to bright lights, such as porch lights, at night.

3. Take into account the colors of the wings. Moths tend to have duller wing colors than butterflies. However, there are many exceptions to this, so this shouldn't be the only way you tell whether you're studying moths or butterflies.

4. Note the kind of cocoon if you have a cocoon. A moth's cocoon is a true cocoon that may appear fuzzy or silky. A butterfly's cocoon is a chrysalis, which is hard and shiny.

5. Observe how the butterfly or moth rests. Butterflies tend to close their wings (have them vertical) while moths tend to keep their wings open while resting.

6. Try to make out the bodies of the butterflies or moths. Most moths have thick, fuzzy looking bodies, while a butterfly's body is usually smooth, long and skinny.

Resources

• Field Museum for more information.
• Library of Congress for more information.