At the 1926 meeting of the Iowa Academy of Science the writer reported on the anatomy of an abnormally developed chick. At the time a statement was made to the effect that such cases were probably not uncommon although they were infrequently recorded in the literature.
Proceedings of the Iowa Academy of Science
©1928 Iowa Academy of Science, Inc.
Fitzpatrick, F. L.
"The Dissection of an Abnormally Developed Foetal Pig with Notes on the Possible Origins of Such "Freaks","
Proceedings of the Iowa Academy of Science, 35(1), 319-325.
Available at: https://scholarworks.uni.edu/pias/vol35/iss1/76