BirdAnalyst
BBS Route · Texas · BCR 37

Rock Island Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 104 species recorded across 49 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 →
49Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1967–2025Span
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
Cliff SwallowHirundinidae2272025+247%1993
Red-winged BlackbirdIcteridae1662025-52%1970
Western Cattle-EgretArdeidae1412025-13%1970
Mourning DoveColumbidae762025+223%1970
Northern CardinalCardinalidae622025+273%1970
Northern BobwhiteOdontophoridae602025+87%1970
Northern MockingbirdMimidae482025+75%1970
Black VultureCathartidae37202513×1977
Eastern MeadowlarkIcteridae302025-52%1970
European StarlingSturnidae292025+775%1983
Common GrackleIcteridae272025-7%1985
Carolina WrenTroglodytidae19202516×1981
Turkey VultureCathartidae172025+875%1973
DickcisselCardinalidae162025+125%1970
Fulvous Whistling-DuckAnatidae142023+47%1970
House SparrowPasseridae132025-92%1970
Brown-headed CowbirdIcteridae112025+0%1970
Green HeronArdeidae102025-52%1971
Scissor-tailed FlycatcherTyrannidae82025-51%1970
Rock PigeonColumbidae82025+73%1980
Great EgretArdeidae72025-66%1970
Little Blue HeronArdeidae72025+18%1970
Yellow-billed CuckooCuculidae72025+32%1970
White-eyed VireoVireonidae72025+113%1995
Great-tailed GrackleIcteridae62025-90%1970
Common NighthawkCaprimulgidae52025-65%1970
American CrowCorvidae52025+23%1971
Chimney SwiftApodidae52025+100%1991
Great Horned OwlStrigidae52024+167%2006
White-winged DoveColumbidae52025-54%2015
Mottled DuckAnatidae42025-54%1971
Pied-billed GrebePodicipedidae42015+300%1972
Inca DoveColumbidae42025-15%1991
Red-tailed HawkAccipitridae42025+133%1994
Blue JayCorvidae32025-11%1972
Lark SparrowPasserellidae31967n/an/a
Tufted TitmouseParidae32025-17%1975
Carolina ChickadeeParidae32024-17%1979
Black-bellied Whistling-DuckAnatidae32025+117%1980
Red-bellied WoodpeckerPicidae32025+57%1972

Source: USGS North American Breeding Bird Survey, retrieved 2026-08-14. A route is a sample, not a census.