Keeping a Nature Journal: Discover a Whole New Way of Seeing the World Around You by Clare Walker Leslie. Hand's down my favorite book on the topic. Great for parents, teachers and homeschoolers as well as adults who want to journal.
Bird nature study printables and resources from Homeschool Creations. Includes scavenger hunts, feeder tally, bird observation sheets, and writing prompts. - bird tally sheets perfect for bird watching on a hike
Exploring Nature with Children & DIY Nature Explorer Packs