Revision of Breeding Bird Survey of North America from Tue, 2014-04-29 07:24

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The North American Breeding Bird Survey (1966-present) consists of data on the diversity and abundance of summer bird assemblages at approximately 5000 sites across the continental U.S. and Canada. Sampling began in 1966 and many sites have time-series that are at least 20 years long.

About BBS

The North American Breeding Bird Survey (BBS) was formally launched in 1966 when approximately 600 surveys were conducted in the U.S. and Canada east of the Mississippi River. Today there are approximately 3700 active BBS routes across the continental U.S. and Canada, of which nearly 2900 are surveyed annually. Breeding Bird Surveys are conducted during the peak of the nesting season, primarily in June, although surveys in desert regions and some southern states, (where the breeding season begins earlier), are conducted in May. Each route is 24.5 miles long, with a total of fifty stops located at 0.5 mile intervals along the route. A three-minute point count is conducted at each stop, during which the observer records all birds heard or seen within 0.25 mile of the stop.

Official BBS Website

Acquiring BBS

BBS Raw Data

FTP site

Supplemental resources 

BBS Survey Routes map layer available at:

GPS coordinates for individual point count stops exist for some BBS routes, but at present (April 2014) are no longer hosted on the BBS website. They used to be found by clicking the 'Raw Data' link, then 'Enter Retrieval System', then 'Retrieve Raw Data', then 'Stop Location Data'.

Using BBS

Best practices

  • For community analyses it is generally best to exclude nocturnal, crepuscular, and aquatic species as they are not well sampled.
  • Surveys where RunType in the Weather table is 0 should be excluded as this indicates a survey that does not pass quality standards.
  • Only use the Run Protocol IDs (counts.RPID) that are appropriate for your study. If you just want standard BBS surveys, use RPID = 101.
  • StopTotal is a measure of incidence (presence/absence), SpeciesTotal is a measure of abundance.

Additional considerations

Be aware of taxonomic changes, and check to make sure that subspecies are not being treated as separate species or that separate species are not being treated as a single species in your analysis.  This is especially relevant if you are interested in making comparisions over a long time period.  Sampling effort is not equal across North America, which is also a factor to take into consideration.

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I see there are some tags at the bottom, e.g. Aves and time series, but it would be useful to have a header that actually says "Tags", because right now it just looks like additional entries under About Using BBS or whatever it is.

This 2012 Ecological Archives dataset ( contains landcover and landscape configuration data for 3,890 BBS routes. Add to EcologicalData and reference it on the BBS data page? (No organismal data, so I don't know how else one would discover it from the Find Data boxes.)

Also, this could be incorporated into the Retriever so it is automatically downloaded and integrated with the bird data!

Both excellent suggestions. Please add away.

We're in the process of planning for how to build integrated datasets into the Retriever and I'll go ahead and add a feature request for adding this one.