BirdAnalyst
BBS Route · Texas · BCR 37

Rock Island Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 104 species recorded across 48 survey years, still active.

104Species 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 →
48Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2024Span
8Observers

Bird Species Found on Texas Rock Island

Top 40 of 104 species by most recent count. Each links to its species trend.

Species recorded on the Rock Island 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
Red-winged BlackbirdIcteridae1482024-49%1970
Western Cattle-EgretArdeidae1202024+0%1970
Cliff SwallowHirundinidae1202024+148%1993
DickcisselCardinalidae742024+112%1970
Mourning DoveColumbidae702024+167%1970
Northern CardinalCardinalidae552024+235%1970
Northern MockingbirdMimidae472024+82%1970
Black VultureCathartidae42202412×1977
Northern BobwhiteOdontophoridae372024+36%1970
Eastern MeadowlarkIcteridae352024-51%1970
Common GrackleIcteridae212024-18%1985
Carolina WrenTroglodytidae15202414×1981
Fulvous Whistling-DuckAnatidae142023+47%1970
Scissor-tailed FlycatcherTyrannidae132024-52%1970
House SparrowPasseridae132024-91%1970
European StarlingSturnidae122024+550%1983
Brown-headed CowbirdIcteridae102024-21%1970
Mississippi KiteAccipitridae92024+250%1981
Turkey VultureCathartidae8202412×1973
Cave SwallowHirundinidae82024-83%2012
Yellow-billed CuckooCuculidae72024+5%1970
Eurasian Collared-DoveColumbidae72024+167%2007
Black-bellied Whistling-DuckAnatidae62023+117%1980
Snowy EgretArdeidae62024+70%1972
Barn SwallowHirundinidae62024+207%1985
Rock PigeonColumbidae62024+9%1980
Little Blue HeronArdeidae52024+18%1970
Great-tailed GrackleIcteridae52024-90%1970
Red-bellied WoodpeckerPicidae52024+86%1972
American CrowCorvidae52024+23%1971
Great Horned OwlStrigidae52024+167%2006
White-eyed VireoVireonidae52024+75%1995
Neotropic CormorantPhalacrocoracidae52021+400%2019
Painted BuntingCardinalidae42024-59%1970
Purple MartinHirundinidae42024-45%1974
Pied-billed GrebePodicipedidae42015+300%1972
Crested CaracaraFalconidae42024+160%1992
Great EgretArdeidae32024-58%1970
Blue JayCorvidae32024-22%1972
Lark SparrowPasserellidae31967n/an/a

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