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A very large grayish grouse with a blackish belly and long pointed tail feathers; male has yellow eye combs, black throat and bib, large white ruff on breast, and averages larger than the female (NGS 1983). Source: Encyclopedia of Life

See files for P. OCCIDENTALIS. Source: Encyclopedia of Life

EGGS: ovate with a tendency toward ovate pyriform (Bent 1921). Ground color varies from dark olive to light buff with markings of dark brown and gray. Markings vary from small dots and scrawls to very large blotches and are often particularly heavy around the larger end of the egg (Goodwin 1960). The average dimensions for 122 eggs in the U.S. National Museum were 34 x 24 mm (Bent 1921). Sourc...