Source: Morrison, M. L., M. P. Yoder-Williams, D. C. Erman, R. H. Barrett, A. S. Leopold, and D. A. Airola. 1985. Natural history of vertebrates of the Sagehen Creek Basin, Nevada County, California. Div. Agric. and Nat. Resour., Agric. Exp. Sta., Univ. Calif., Berkeley. 16 pp. (Link)
unknown
Occurence status describes how common or rare a taxon is in a given area. See DarwinCore for more information on terminology.
present
occurs in the area
common
occurs frequently
uncommon
occurs regularly, but in small numbers; requires careful searching of proper habitat
irregular
presence unpredictable, including vagrants; may be common in some years and absent others
doubtful
presumed to occur, but doubt exists over the evidence
absent
does not occur in the area
Native
Establishment means describes how the taxon came to be established in an area.
See DarwinCore for more information on terminology.
native
evolved in this region or arrived by non-anthropogenic means
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