Moths
No adult moth in North America can hurt you. Several of them are among the largest and most striking insects on the continent, and the biggest ones cannot even eat, let alone bite.
5 species, each checked against a reference source.
All species
Start with a photograph
Identify an insect from a photo. The result includes confidence, common lookalikes and a plain safety assessment; read its accuracy and limits before treating a low-evidence photo as definitive.
Moth, butterfly, or something else
Almost everything people ask about a large moth comes down to having placed it in the wrong group first — usually as a butterfly, occasionally as a hummingbird.
- Antennae are the reliable test: a small club or knob at the tip means a butterfly, feathery or plain and tapering means a moth.
- A thick, furry body means a moth. Butterflies are slender and smooth.
- Powdery scales that rub off on your fingers — that is a moth or butterfly, and nothing else.
- Flying at night is a moth habit but not a rule; plenty of moths, including the hummingbird clearwing, fly in full sun.
- Hovering at a flower in daylight with a long feeding tube is a sphinx moth, not a small hummingbird.
The adult tells you nothing about the caterpillar
The two life stages are unrelated as far as danger goes, and assuming otherwise is how people actually get hurt. The io moth is a harmless, rather beautiful adult whose caterpillar carries venomous spines. Running it the other way is just as wrong: a hornworm carries a spike at its rear end that looks exactly like a weapon and does nothing at all. Judge the animal in front of you, not the one it used to be or the one it will become.
Common questions
Do moths bite?
No. Adult moths have a coiled feeding tube for nectar or, in the giant silkmoths, no working mouthparts whatsoever. The holes in your jumpers are made by clothes moth larvae, not by any adult moth.
Why can't the big ones eat?
Giant silkmoths — cecropia, polyphemus, luna — emerge without functioning mouthparts. They live about one to two weeks on what they stored as caterpillars, mate, and die. One dying a few days after you found it is not something you did.
Why do moths fly into lights?
They navigate by distant light, and a nearby bulb overwhelms that system. It is not attraction so much as a navigation failure — which is also why turning the light off is all it takes to end it.
I found a huge moth on my door. Is it rare?
Almost certainly not. The polyphemus moth is the most widespread giant silkmoth on the continent and turns up in nearly every state. They are simply nocturnal and short-lived, so seeing one is a matter of timing rather than luck.