Sandra Markle's Butterfly Tree is a book in this vein. The text, though not rhyming, is written in stanzas and the fuzzy (oil paint?) illustrations give the book a somber tone and set a thoughtful pace. The story is about a girl witnessing a giant migration of monarch butterflies: it looks like it's raining black pepper from a clear blue sky. She is confused and frightened at first as she and her mother go to investigate in the woods. All her senses seem heightened as she goes through the trees noticing things until suddenly An explosion of golden-orange bits fills the sunlight streaming between the branches.
I especially appreciated the endnotes in this book as it fills in the gaps on a personal level with the author and shows an informative map illustrating the migration routes of Monarchs. The book would make an excellent fill in on a butterfly study or general winter preparation/migration/hibernation studies for animals.