Gertrude McFuzz by Dr. Seuss

Here is a fascinating story.  Gertrud McFuzz is a bird, who envies the pretty tail feathers of other birds, as she does not have enough feathers.  Consequently, she overdoes on the feather growing pill, and gets so many feathers she can't fly, or even really walk.  Sometimes we need to be content with what we have, and not worry about what we don't have.  Gertrude learned that it is painful to have all those extra feathers pulled.