The Historic Shuford Species List comes from the 1993 publication by David Shuford entitled "The Marin County Breeding Bird Atlas: A Distributional and Natural History of Coastal California Birds". Our current re-survey of Marin County's breeding birds follows the methods of this previous atlas project.

Breeding Codes

The species present in a block may be filtered by the following breeding parameters:

1. Confirmed: This lists all the species that have been recorded with the codes/observations that confirm breeding
2. Confirmed, Probable: This lists all the species that have been recorded with the codes/observations that both confirm and indicate probable breeding
3. Confirmed, Probable, Possible: This lists all the species that have been recorded with the codes/observations that support possible or probable breeding, or that confirm breeding

These options all eliminate species that were detected in the block but without evidence to suggest they might be breeding there (e.g., those known to not breed there such as migrants, those that might be dispersing, etc). For the current Atlas, it is generated predominantly with survey data submitted in CADC; data submitted via the Incidental form, eBird, by other scientific monitoring programs, and recently on CADC will be delayed in their inclusion here.

Percent Completion

The equation for determining when a block is preliminarily called "complete" is listed below. It does not necessarily indicate that surveys should completely cease, but that it is appropriate for the block leader to reduce effort and target certain species or areas, or to focus on another block for the current season. Note, it is generated predominantly with proofed (clean, not raw) survey data submitted in CADC, as well as data submitted via the incidental form and by other scientific monitoring programs. Note, recent Atlas submissions to CADC and via the incidental webform will not show up automatically as some data processing is required before the data are pushed to the Data Explorer. In the event that more species are seen in the current survey as compared to the historic, the percentage is rounded down to 100%.