bestiary (n.) Look up bestiary at Dictionary.com
"medieval treatise on beasts" usually with moralistic overtones, 1818, from Medieval Latin bestiarium "a menagerie," also "a book about animals," from bestia (see beast).

A Latin term for such works was liber de bestiis compositus. Roman bestiarius meant "a fighter against beasts in the public entertainments." Bestiarian (1882), modeled on humanitarian, was a word for "one who advocates kind treatment of animals," especially "anti-vivisectionist," but earlier bestiarianism (1864) had been used as the opposite of humanitarianism in reference to cruel and brutal policies.