When Mr. Cooper gives Peggy a new baby duck, she promises to take good care of it. But when Fluff's feathers begin to droop and his eyes are no longer bright and shiny, Peggy discovers why and learns that good nutrition is very important - for growing ducks and growing girls! Books in this perfect STEM series will help kids think like scientists and get ahead in the classroom. Activities and experiments are included in every book! (Level One; Science topic: Nutrition)