BirdAnalyst
BBS Route · California · BCR 32

Colma Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 74 species recorded across 5 survey years, no longer active.

74Species RecordedSpecies recordedDistinct species detected on standard-protocol BBS runs here across all years on record — a measure of survey breadth, not a complete checklist.Full methodology →
5Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–1972Span
1Observers

Bird Species Found on California Colma

Top 40 of 74 species by most recent count. Each links to its species trend.

Species recorded on the Colma route.
Recent countThe raw number of individuals recorded on this route in its most recent survey year. A single-route tally, not a trend.Full methodology →TrendPercent change in the route-weighted abundance index between a smoothed baseline window and the most recent one. It tracks direction, not absolute population.Full methodology →Baseline yearThe first year of the smoothed window the trend is measured from. An earlier baseline means a longer record stands behind the number.Full methodology →History
House FinchFringillidae2651972-19%1969
Brewer's BlackbirdIcteridae1751972+50%1969
California Scrub-JayCorvidae1151972+44%1969
Chestnut-backed ChickadeeParidae1071972-5%1969
California TowheePasserellidae941972+4%1969
Red-winged BlackbirdIcteridae581972+75%1970
European StarlingSturnidae56197211×1969
Spotted TowheePasserellidae411972+13%1969
House SparrowPasseridae411972-11%1969
Mourning DoveColumbidae401972+6%1969
Pine SiskinFringillidae381972-45%1969
California QuailOdontophoridae321972-47%1969
Lesser GoldfinchFringillidae301972+11%1969
White-crowned SparrowPasserellidae301972+51%1969
Oak TitmouseParidae241972+34%1969
BushtitAegithalidae241972-58%1969
Northern MockingbirdMimidae231972+242%1969
Cliff SwallowHirundinidae221972-84%1969
Bewick's WrenTroglodytidae181972-65%1969
Acorn WoodpeckerPicidae171972+82%1969
WrentitSylviidae171972-41%1969
Steller's JayCorvidae141972+150%1969
Song SparrowPasserellidae121972+9%1969
Western GullLaridae111972-85%1969
Western MeadowlarkIcteridae111972+81%1969
Anna's HummingbirdTrochilidae101972+15%1969
California ThrasherMimidae101971+400%1968
American RobinTurdidae101972-18%1969
KilldeerCharadriidae91972+50%1970
Black-headed GrosbeakCardinalidae81972+29%1969
Purple FinchFringillidae71972+190%1969
Caspian TernLaridae61972-11%1969
Ash-throated FlycatcherTyrannidae61972+0%1969
Allen's HummingbirdTrochilidae61972+50%1970
MallardAnatidae51972+340%1969
Hutton's VireoVireonidae51972-38%1969
Orange-crowned WarblerParulidae51972+80%1969
Western Wood-PeweeTyrannidae41972+0%1969
Western TanagerCardinalidae41968n/an/a
Loggerhead ShrikeLaniidae41968n/an/a

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22. A route is a sample, not a census.