The Faculty of Science is divided into eleven departments, each with distinct teaching and research focuses. Departments are housed in several buildings across campus, including Herzberg Laboratories, Steacie Building, Tory Building, the Nesbitt Biology Building, and the Health Sciences Building. Each of these buildings house laboratories and other facilities for faculty and students alike to conduct research. The Nesbitt Biology Building contains several climate-controlled greenhouses that are host to an annual Butterfly Show in late September to early October, attracting visitors throughout the National Capital Region. The National Wildlife Research Centre, a research facility of Environment and Climate Change Canada is also located on campus, and is home to the National Wildlife Specimen Bank, a repository of over 12,000 specimens of wildlife native to Canada. The centre conducts important research on the effects of toxic substances on wildlife, international migratory bird patterns, and the effects of human activities on wildlife.