In addition to the color and behavioral differences often used to differentiate 'moths' from 'butterflies', the antennae may also be used to differentiate the two groups. Butterfly antennae each usually terminate in a knob-like swelling not normally found on the more whip-like or feathery antennae of the moth.
Butterflies of North America, USGS
Photos: Courtesy of S.P. Johnson
|Cloudless Sulphur Butterfly|