They are skinny with little knobs on the end. Butterflies use their antenna to smell flowers, plants, and other butterflies. A butterfly has two compound eyes - lots of little eyeballs grouped together. Each eyeball sees a little part of what the butterfly is looking at. It's like looking through a bunch of straws bundled together.
Butterflies can see colors.
Click here to see the sulfur yellow's eyes up close. Proboscis A proboscis is like a long tongue or drinking straw. The butterfly uncoils its proboscis and sips up flower nectar or fruit juice. That's how they find flower nectar and the best plants to lay their eggs. The two front legs are small and covered with small hairs.