One day on a walk with his dad Charlie sees some boys and girls on the rooftop of the school saying goodbye as they release butterflies up into the sky.
Charlie is amazed by all the butterflies flying around and wishes he could do something like that too. And when Charlie starts school next year he becomes a "butterfly scientist" as well and helps his teacher and classmates care for some teeny tiny caterpillars as they grow into butterflies and are released by Charlie and his class. "Bye Bye Butterflies!"
A boy is delighted to see children releasing butterflies off of a rooftop (shouting Bye, bye, butterflies! as they do so) while walking with his father; months later, his class receives its own box of tiny caterpillars that he learns will also transform into butterflies. Larsen playfully depicts the caterpillars development from striped and polka-dotted grubs to cocoons, as the children cartoon caricatures with exaggerated eyes and oversize heads observe and document the subtle changes. When Charlie and his class finally release the butterflies, another boy glances up to the rooftop and waves to Charlie. A tender story about life cycles, metamorphosis, and a common childhood experience. Ages 4 up.