E. Roth. 2002. Abundance and distribution of common raven and American crow in the San Francisco Bay Area, California. Western Birds 33:202-217. Kelly, J. P., K. L. Etienne, and J. E. Roth. 2005.
April is sage-grouse nesting season. Males are strutting on their leks. Females are visiting these leks to get bred and then ...
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