Patricia V. Turner, BSc, MS, DVM, DVSc, DACLAM, DABT, DECAWBM, is a Professor of Comparative Pathology (Laboratory Animals and Small Mammals) in the Department of Pathobiology at the Ontario Veterinary College, University of Guelph, Canada. Marina L. Brash, DVM, DVSc, DACVP, is a Pathologist of Avian and Fur Bearing Species at Animal Health Laboratory, University of Guelph, Canada. Dale A. Smith, DVM, DVSc, is a Professor of Comparative Pathology (Avian, Exotic, Wildlife and Zoo Animals) in the Department of Pathobiology at the Ontario Veterinary College, University of Guelph, Canada.