In these three images you can see first a butterfly's antennae in the Striped Hairstreak (Satyrium liparops). They are thin and have a little bulge on the end. They are called "knobbed" antennae. Moths have two main types of antennas - one is on is a Wooly Bear Moth (from a Wooly Bear Caterpillar - prob Isia spp.). Its antennae are just straight and thin - no knobs. Then the Luna Moth (Actias luna) has the beautiful feathered antennae found on some species of moths - especially in the males.