Start with high-confidence endangered species books, then narrow by subgenre or adjacent topics.
The Tiger
John Vaillant
Vanishing Treasures
Katherine Rundell
End of the Megafauna
Ross D E MacPhee, Peter Schouten
The Eye of the Elephant
Mark Owens, Delia Owens
The Black Rhinos of Namibia
Rick Bass
The Hunt for the Golden Mole
Richard Girling
Now Is the Time to Collect
Paul D. Brinkman
The Ecological Buffalo
Wes Olson
The Elephant Whisperer
Lawrence Anthony, Graham Spence
The Sixth Extinction
Elizabeth Kolbert
Nature's Last Dance
Natalie Kyriacou
The Loneliest Polar Bear
Kale Williams
