I have always loved the The Butterfly Alphabet by photographer Kjell Sandved and often hang the poster in my classroom when we study insects. His story is a wonderful one - one perfect to share with children! It all started when Sandved came to the Smithonian Institution National Museum of History to conduct research for an encyclopedia on animal behavior. Exploring the collections, he pulled down a dusty, Cuban cigar box filled with exotic butterflies and moths. "There, on the wing, I saw a beautiful letter 'F.' I'll never forget it. I thought, 'My God, how can nature put something so beautiful on a butterfly's wing?" From there, Sandved taught himself how to take photographs and began traveling the world. He discovered letter shapes in other places too and these were organized into the Nature Alphabet poster.
A is the stretch of an inchworm.
B are the curls of a strangler vine.
C is the twist of a monarch caterpillar.
Science News for Kids has a great article about Sandved. You can also find out more about his story here.