. A history of British birds . esand a quarter ; the lirst and second primary quill-feathersof equal length, and the longest in the wing. The female differs from the male in having the plumageof dull brown, which is lightest in colour about the cheeksand under surface of the body ; the beak dark olive; thefeet greyish-brown. There is considerable individual variation in this Scoter,and some examples from California have been distinguishedas G^demia {Pelionetta) perspicillata trowhridgii. It has been stated that the trachea of the Surf Scoterresembles that of the Velvet Scoter, but Mr. HerbertL
. A history of British birds . esand a quarter ; the lirst and second primary quill-feathersof equal length, and the longest in the wing. The female differs from the male in having the plumageof dull brown, which is lightest in colour about the cheeksand under surface of the body ; the beak dark olive; thefeet greyish-brown. There is considerable individual variation in this Scoter,and some examples from California have been distinguishedas G^demia {Pelionetta) perspicillata trowhridgii. It has been stated that the trachea of the Surf Scoterresembles that of the Velvet Scoter, but Mr. HerbertLangton, in The Zoologist for 1881, p. 59, points outsome differences. An illustration is given by Thompson inthe Annals of Natural History, xviii. p. 370. The vignette below represents the difference in the extentof the membrane depending from the hind toe of the twodivisions of true Ducks : that on the left side belongs to thefirst division, or Surface-feeding Ducks ; that on the rightto the second division, the Diving 488 AN SERES. ANATIDiE.
Size: 2038px × 1226px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorsaun, bookcentury1800, bookdecade1870, booksubjectbirds
