Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
On Dec. 30, 1949 a male opossum of undetermined age was presented at Stange Memorial Clinic, with a history of having lost its hair in irregular shaped patches.
Swift, George E.
"A Case of Alopecia Areata in an Opossum,"
Iowa State University Veterinarian: Vol. 12
, Article 16.
Available at: https://lib.dr.iastate.edu/iowastate_veterinarian/vol12/iss2/16