Bonaparte, Charles Lucian, 1803-1857 / American ornithology, or, The natural history of birds inhabiting the United States, not given by Wilson : with figures drawn, engraved, and coloured, from nature
Dusky grous. Tetrao obscurus. Plate XVIII. Female, pp. 27-36 ff.
~~~DUSKY GRUS. 31 . ~ 1 1 _ l _1 .-1 I . 1 1 -.1tt- Iger ,4ni moser. :AU the others nave. te toes cabrous +Dneat'n and frinished withl a, petiated row of processesU r´ea4Wh side.* This roughness of the sole of the feet enables. them tiotread firmly on the slippery suface of the ground :or frozen snow, or to grasp the branches of trees covered with ice. Their nails -are manifestly so formed as to, suit them fr scratcing away the snow cQvering the vegetables whi compose their food.. The wings of the Grouse are short and rounded, the first primary is shorter- han the third and fourth, which are longest. The tail is usuall Omposed of eighteen feathers, generally broad and rounide. - The Red Grous, T. scoticus, however, and the European Bonasile, and; T. canadensis or Spotted Grous, have but sixteen; while our two new North America'n species have twenty onew of them having these bfeathers very narrow and pointed, the narrowness being also observed in the Sharp-tailed Grous. They have the head small, the neck short, and the body massiver and very fles. The females of. the larger species differ greatly from the males, which are gossy black, or blackish, while the former are mted with gray, blackish, and rufous: such are all the typical Taones of Europe, and the Cock of the Plains, the Dusky, andl the Spotted Grouse of America.: The smaller, species, in which both sexes are mottled, such as T1 phasianellus and T. cupido, exhibit little or nn .diffierence iin the nlumae of the two- sexes: which is also the Ör r---- case in all the Bonasia and-Lgpds feathers are in all respects like the femr acquiretheir full plumage until after the tie, a year, and most of the Lagopodes the seasons in a remarkable manner. These processes iaeliable to fall off, at least in p ; dirciiinsa that we committe sel erors in ypnoai#Vo the Bir f he Uitd tales.
Based on date of publication, this material is presumed to be in the public domain.| For information on re-use, see http://digital.library.wisc.edu/1711.dl/Copyright