Following upon their publication of José R. Castelló’s 2016 “Bovids of the World” and 2018 “Canids of the World,” Princeton University Press has now let the cat out of the bag with their publication of his most recent taxonomic family-level field guide “Felids and Hyenas of the World: Wildcats, Panthers, Lynx, Pumas, Ocelots, Caracals, and Relatives.”