Start with high-confidence nature resources books, then narrow by subgenre or adjacent topics.
Animal Behavior
DK, D.K. Publishing
A Guide to Common Freshwater Invertebrates of North America
J. Reese Voshell, J. Reese Voshell Jr.
Wildlife of the World
DK, Don E. Wilson
North American Bird Watching for Beginners
Sharon Stiteler
