A natural-history study surveys the characters and habits of several large terrestrial mammals — elephant, lion, leopard, panther, jaguar, tiger, puma, wolf, and grizzly bear — combining field observations, captive anecdotes, anatomical notes, and behavioral interpretation. The author compares social structures, temperaments, and responses to captivity; discusses instances of aggression, domestication, and solitary behavior; and contrasts hunting methods and ecological roles. Illustrations accompany descriptive chapters that blend practical observation with critical discussion of prevailing opinions.