https://carolsimonlevin.blogspot.com/search/label/Caterpillars%20%26%20Butterflies
Bob and Otto – Robert & Nick Bruel (Otto the worm is saddened when his friend Bob the caterpillar becomes a butterfly until Bob reassures him that his role in digging through the earth is critical in this story which beautifully combines earth science and the power of friendship.)
The Very Hungry Caterpillar - Eric Carle (reinforcing days of the week and counting, talked about how Eric Carle used colored tissue paper to make his collage papers)
If at First You Do Not See - Ruth Brown (kids practiced close observation with this clever book -- vegetation becomes faces when the pages are turned upside down...possibly inspired by the works of the 16th c. Italian painter Guiseppe Arcimboldo)
Waiting for Wings -- Lois Ehlert (different sized pages and beautiful collage illustrations reinforce the butterfly life cycle. A musical version is on the Scholastic DVD Singalong Stories, great to act out with scarves).
Art idea: have the children make nature collages inspired by the books "The Very Hungry Caterpillar" and "Waiting for Wings"