I’m racking my brain to remember a favorite childhood book. The premise of the story is a whale who is traveling down a river in the jungle (I think it’s a jungle?) who meets other animals along the way and he is sad that he is not colorful like they are. The other animals help him become colorful by rubbing different colored plants on him. I vaguely recall the cover of the book, but I do remember that it was rectangular in shape. I was born in 1979 and I don’t think this book was published much before or after that. Maybe 1987 at the latest? Does anyone recall coming across this book?