William T. Walters' enthusiasm for the work of the French sculptor of animals Antoine-Louis Barye led him to acquire not only a large number of bronzes of exceptional quality but also many sketches and watercolors. Barye was friends with Eugène Delacroix and together the two observed animals, both living and dead, at the zoo in Paris. Barye attended dissections and often added measurements to his drawings. Such patient studies resulted in vividly lifelike portrayals of animals in both two and three dimensions.