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
The budgerigar, that variety of parakeet which we are interested in, ranks very closely with cats and dogs as to the number of pets. As more of our population moves into congested areas, the small space which they require will make them increasingly more popular as pets. The owner of a pet budgie, especially one properly tamed and taught to talk, becomes just as attached to it as the dog owner does to his dog.
Evans, George A.
"Diseases and Care of Parakeets,"
Iowa State University Veterinarian: Vol. 21
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol21/iss2/3