Plumage Characteristics as an Indicator of Age Class in the Surf Scoter. Iverson, S., Esler, D., & Boyd, S. Waterbirds, 26(1):56-61, 2003.
bibtex   
@article{
 title = {Plumage Characteristics as an Indicator of Age Class in the Surf Scoter},
 type = {article},
 year = {2003},
 keywords = {1,2003,56-61,age determination,animals is im-,bursal evaluation,determining age classes of,melanitta perspicillata,plumage appearance,scoter,sea duck,surf,tail feather notching,waterbirds 26},
 pages = {56-61},
 volume = {26},
 id = {83107a69-9113-3f70-845a-aa9a324899ba},
 created = {2012-11-28T19:32:13.000Z},
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 last_modified = {2018-02-13T18:14:50.108Z},
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 bibtype = {article},
 author = {Iverson, S.A. and Esler, D. and Boyd, S.W.},
 journal = {Waterbirds},
 number = {1}
}

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