By F. C. Zwickel
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Extra info for Blue Grouse: Their Biology and Natural History
Lumsden (1968, p. 89) noted “many elements” of the voice of sage-grouse and some aspects of display behaviour are similar to some of those of blue grouse. (i) Egg colour and length of incubation period. Short (1967) summarized information on egg colour for the different genera of grouse. Except for size, he suggested eggs of Canachites, Dendragapus, and the paler eggs of Centrocercus are similar. In our view, background colour of eggs of blue and spruce grouse are most alike, but in terms of extent and kind of marking, those of blue and sage-grouse are most similar.
2), with their eastern most limit near Colorado Springs, CO. In general, interior races extend north and south along the Rocky Mountains and their outlier ranges, and coastal races north and south along the Sierra Nevada and Cascade and Coast Mountains, including their outlier ranges. The two groups coalesce in the northern Cascade Mountains, beginning at about the Kittitas Valley in Washington State. o. pallidus and richardsonii replace sierrae on the eastern slopes of these ranges. Precise boundaries between some subspecies are not well defined and may never be so because of continuous distributions and apparent subspecific hybridization, with gradients rather than sharp discontinuities in some morphological characteristics.
O. o. o. sitkensis), although physical criteria for doing so are less clear than for interior birds. North coastal birds are separable from all other groups by their use of mesic, humid habitats, but are morphologically and behaviourally similar to south coastal subspecies. , characteristics of song and flutter flights of males, lateral cervical apteria of males, size of male syringes, female plumage, and natal down. , characteristics of tail bands and numbers of rectrices. Thus, in comparing interior and coastal groups, the southern forms within each appear more closely related to each other than do the northern interior and coastal forms.