Atlas moths lack a complete digestive system as adults — there's nothing for food to go through, even if they could eat.

Brown recluses have six eyes (not eight, like most spiders) — arranged in three pairs.

The death's-head hawkmoth has a clear human skull pattern on its thorax — coincidence of natural pattern, not deliberate mimicry.

Fireflies aren't flies — they're beetles. The order is Coleoptera, family Lampyridae.

Despite the name 'centipede' (Latin: 100 feet), no centipede actually has 100 legs — counts are always odd-paired numbers like 21, 23, or 47.

Glasswing butterfly wings are transparent — you can read text through them.