Published information on papillomas, commonly called horns, on cottontails (Sylvilagus floridanus) in Iowa dates back to 1907. Specimens of horned rabbits are on record from Woodbury, Pottawattamie, Cherokee, Franklin, and Boone counties. Those from the last two counties were necropsied at Iowa State University in 1958 and 1959-60, respectively. Information from conservation officers and biologists shows sight records for a number of years past for at least 16 additional counties. The malady seems to be limited almost entirely to the western half of the state.
Proceedings of the Iowa Academy of Science
©1960 Iowa Academy of Science, Inc.
Haugen, Arnold O.
"Cottontails With "Horns","
Proceedings of the Iowa Academy of Science, 67(1), 610-615.
Available at: https://scholarworks.uni.edu/pias/vol67/iss1/77