W. S. Brooks, 1915,
Banks Island, Canada.
A highly controversial and variable taxon, treated as a race alternatively of a broad L. argentatus or of L. glaucoides. Interbreeds with L. g. kumlieni in N Hudson Bay and E Baffin I, prompting latter treatment as a race of L. glaucoides. Although seemingly random pairing occurred in N Hudson Bay, a deficit of intermediate plumages suggested that post-mating isolation may exist. Pending further studies, thayeri is best treated as a discrete species. Merging it with L. glaucoides, as again proposed recently#R, would make latter species undiagnosable. Monotypic.
N Canada from Banks I E to N Hudson Bay and N Baffin I (E to vicinity of Home Bay), N through Ellesmere I to W Greenland (near Thule). Winters on Pacific coast from SW Canada (British Columbia) to NW Mexico (Baja California); regular but uncommon in Great Lakes region.
Food and feeding
Status and conservation
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