Mouse. It has a genetically similar genome to humans and can be easily manipulated to create individuals with specific genetic conditions, making them very useful for researching human diseases.

Ferret. It has relatively large lungs and five lung lobes (the parts that form the lungs), compared to its body size. It also has receptors in its respiratory tract where viruses can bind, similar to humans. It can transmit respiratory illnesses to other ferrets through coughing or sneezing, making it a suitable animal for studying respiratory viruses.

Primate. It is used for various disease research due to its similarity to humans in the nervous, immune, endocrine, circulatory, and respiratory systems. It is particularly used for diseases such as cancer, cardiovascular disease, stroke, and Parkinson's disease.

In addition, it is very useful for understanding human neurological development and behavioral processes. It exhibits behaviors similar to humans due to its high cognitive ability, learning ability, problem-solving ability, and social interaction ability.