Did you know that Slovenian professor Dr. Simon Horvat from the UL BF discovered the obesity gene? How do researchers care for mice in the laboratory? Why is handling tunnels important for the well-being of mice? What behavioral tests do they perform and what do they use them to investigate? What can we learn about humans from the behavior of mice? And what can we learn about humans from the behavior of mice? We present a documentary video about research on laboratory animals at the University of Ljubljana Biotechnical Faculty.