Deer mice (Peromyscus maniculatus) were captured along an altitudinal gradient that extended from 5,000 feet (1524 m) up to 11,000 feet (3353 m) in central Colorado during August and early September, 1976. Starch gel electrophoresis of deer mouse hemoglobin followed no clear trend that would indicate that slight biochemical differences in the molecule help facilitate adaptation to the decreased pO2 that exists at that altitude.
Wasserman, David and Nash, Donald J.
"Variation in hemoglobin types in the deer mouse (Peromyscus maniculatus) along an altitudinal gradient,"
Great Basin Naturalist: Vol. 39
, Article 9.
Available at: http://scholarsarchive.byu.edu/gbn/vol39/iss2/9