Once a Mouse... - by Marcia Brown
This 1962 Caldecott medal winner is a re-telling of an Indian fable in which a hermit meditates about things big and small. The hermit knows the magic that can change a small mouse into a cat, a dog, and a majestic tiger. But when the former mouse gets puffed up in his power and size, he forgets his former humility and vulnerability. This is a fable that teaches gratitude, humility, and loyalty.