Leucism in the western bluebird (Sialia mexicana) is reported from La Plata County, Colorado.
Ellis, Kevin L. and Parrish, Jimmie R.
"A case of leucism in the western bluebird (Sialia mexicana),"
Great Basin Naturalist: Vol. 48
, Article 12.
Available at: http://scholarsarchive.byu.edu/gbn/vol48/iss1/12