The list author says: "This is a list of books I've enjoyed about park rangers and game wardens - - both real and fictional. These folks have interesting outdoor careers, interacting with wildlife and with a wide range of people, making a good story very interesting. The fiction is mostly murder mysteries, either involving park ranger Anna Pigeon (by Nevada Barr) or Wyoming game warden Joe Pickett (by C. J. Box)."
"Tiny Grosz moves up the career path at the US Fish and Wildlife Service, working on endangered species, international trade in wildlife, as well as continuing to catch poachers and wetlands violators in the Dakotas."