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Lab animals refer to organisms used in scientific research and testing, typically housed and bred under controlled conditions in specialized facilities. They are carefully selected based on specific traits and characteristics, including their size, lifespan, genetic makeup, and reproductive capabilities. Mice are one of the most commonly used lab animals due to their small size, short gestation period, and ease of handling. Farm animals such as pigs, cows, and sheep may also be used as lab animals in certain studies, particularly those involving large animal models or agricultural research. Overall, lab animals play a crucial role in advancing our understanding of biology, medicine, and disease, enabling researchers to develop new treatments, therapies, and technologies that improve human and animal health.