Start with high-confidence nature photography books, then narrow by subgenre or adjacent topics.
I Am Maru
mugumogu
Unlikely Friendships
Jennifer S. Holland
Farm Life
Randal Ford
David Yarrow Photography
David Yarrow, Tom Brady
Birds of the Photo Ark
Noah Strycker, Joel Sartore
Wild Eye
Beverly Joubert
STILL
Mary Jo Hoffman
60 Years of Wildlife Photographer of the Year
Rosamund Kidman Cox
Animal Kingdom
Randal Ford, Dan Winters
Edible Plants
Jimmy Fike
What the Bees See
Craig P. Burrows
Paul Nicklen
Shells
Paolo Portoghesi