This document discusses common laboratory animals used in drug development research. It begins by introducing the importance of animal models that share physiological and anatomical similarities with humans. It then classifies disease models and research types that utilize animal subjects. The majority of the document focuses on describing specific rodent animal models commonly used - rats, mice, guinea pigs, gerbils, and hamsters. Details provided include typical strains, applications in research, anatomical features, life cycles, and other relevant information. A brief overview of non-rodent models like rabbits, monkeys, cats, and dogs is also presented.