Is it a moth or a butterfly?

It sounds like a simple question, and there are a few simple ways to answer it: If it flies during the day, it's a butterfly; if it flies at night, it's a moth.

However, there are diurnal moths --- those that fly during the day, and there are crepuscular butterflies that fly during dawn or dusk.

You could also answer the question, if it has bright colored wings, it's a butterfly, but if it has dull colors it's a moth.

But yet again, that doesn't always apply. The Madagascan sunset moth has crazy bright colors, and the common sootywing butterfly is pretty drab.

It turns out there are plenty of hard and fast rules that quickly become loose when looking at the thousands of species of butterflies and moths in the world.

(Find a free butterfly mask template here.)

In the order of Lepidoptera, which contains both butterflies and moths, about 89-94 percent of the species are moths while 6-11 percent are butterflies. All of these species have wings with scales that are shed over their lifetimes. They all have three body parts. The head has two compound eyes, two antenna and a proboscis that extends to suck up liquid like water or nectar. The thorax and abdomen house the two pairs of wings and three pairs of legs.

Plus, all moths and butterflies go through complete metamorphosis, from egg to larva (caterpillar) to pupa (chrysalis or cocoon) to adult.

(Directions on how to make an origami butterfly.)

There are some simple ways to tell apart most moths and butterflies.

Frenulum: Moths usually have a frenulum, which is a wing-coupling device that joins together the forewing and hindwing. Butterfly wings are separate except for the Regent Skipper in Australia which is the only known butterfly to have a frenulum. Some moths don't have a frenulum.

Antenna: Butterfly antenna are club-shaped with a long shaft and a bulb at the end. Moth antenna are typically feather or saw-edged. Some moths do have club-shaped antenna, but no butterflies have feathery antenna.

Graphic of a moth and butterfly

A. A Jamaican moth with feathery antenna, B. Painted lady butterfly with clubbed antenna

Caterpillars: Both moths and butterflies are caterpillars in the larval stage, and many moth caterpillars can be described as fuzzy, although not all. No butterfly caterpillars are considered fuzzy.

Graphic of moth and butterfly caterpillars

A. Io Moth fuzzy caterpillar, B. Monarch butterfly sleek and smooth caterpillar

Pupa: In the pupa stage, moths create a cocoon, which is wrapped in a silk covering. Butterflies create a chrysalis, which is hard, smooth and is not silky. Not all moths create a cocoon though. The tomato hornworm, for example, creates a pupation chamber in the ground instead.

Graphic of butterfly and moth chrysalis and cocoon

A. Black swallowtail butterfly with smooth chrysalis, B. Tiger moth cocoon with silk covering

Wings: Moths usually land with wings spread, whereas butterflies tend to land with their wings folded back.

Graphic asking moth or butterfly with two photos

A. Moth with wings spread, B. Monarch butterfly with wings folded back

Body shape: Moth bodies are most often shorter, fatter and have thicker hair than butterfly bodies, which are usually longer, skinnier and have longer legs.

Graphic of butterfly and moth

A. Aphrodite fritillary butterfly with thinner body, B. Sphinx moth with thicker body shape

The fact that each species is unique makes identification a challenge, but it also proves how incredibly awesome the natural world is.

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15 Comments

  1. Daniel jin on July 16, 2020 at 11:07 pm

    Thank you. The differences are interesting. I learnt something new today.



  2. JoAnn on April 19, 2020 at 11:57 am

    I have a little 3/4 caterpillar that is green with a little yellow and I want to know if it is a boy or girl and know if it’s a butterfly or moth how do I find out



    • kiley on April 20, 2020 at 8:47 am

      We recommend using the tools above to see if it is a butterfly or moth. As to a boy or girl, you’ll have to wait until it’s an adult!



  3. Doni on April 2, 2020 at 9:10 pm

    Informative and you answered most of my questions. Thanks very much.
    Where would I likely find butterfly Chrysalises please? I live in East Texas and am surrounded by trees & wildlife.
    Thank you! ✌



    • kiley on April 3, 2020 at 8:31 am

      You would find them on milkweed, but they can be quite camouflaged! Best of luck!



  4. Kirlia on October 8, 2019 at 5:28 pm

    What is the difference between butterflies eggs and moth eggs? Which one is hard or soft?



    • kiley on October 9, 2019 at 8:30 am

      The egg of each species is different, so it really depends 🙂



  5. Moh on June 27, 2019 at 3:37 am

    Very useful! Thanks



  6. Jadynn Bachman on May 20, 2019 at 2:33 pm

    I found two orange, hairy, caterpillars. I was wondering if they’re a moth or butterfly, and if they’re poisonous or not?



  7. Jadynn Bachman on May 20, 2019 at 2:31 pm

    I found a hairy, orange, caterpillar. I was wondering if it’s a moth or butterfly, and if it’s poisonous or not?



  8. Sue on April 16, 2019 at 8:35 am

    I have three cocoons (moths?) that I’ve been trying to identify. Where can i send photos so I know what these are?



  9. Lahoucine A. on November 8, 2018 at 8:31 am

    Very interesting and useful ! Thanks a lot.



  10. Shawna G on October 31, 2018 at 8:33 pm

    i got all those right without looking first. moths and butterflies are so easy to tell apart



  11. denise norris on September 21, 2018 at 3:00 am

    thank you.my daughter gave me some homework today.i can tell her its been completed and I can answer her questions now.



  12. Ashim on August 17, 2018 at 2:13 am

    NICE!!!!!