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Measurements
Linear
No data on geographic variation (Appendix 2 .)
Mass
Varies throughout year; little specific information available (see Breeding: incubation).
Dugger, B. D., K. M. Dugger and L. H. Fredrickson. 2009. Hooded Merganser (Lophodytes cucullatus), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: http://bna.birds.cornell.edu/bna/species/098
