BirdAnalyst
BBS Route · Texas · BCR 37

Petronila Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 84 species recorded across 39 survey years, still active.

84Species 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 →
39Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
1968–2025Span
5Observers

Bird Species Found on Texas Petronila

Top 40 of 84 species by most recent count. Each links to its species trend.

Species recorded on the Petronila 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
Great-tailed GrackleIcteridae2552025+210%1970
Laughing GullLaridae2272025+336%1970
Red-winged BlackbirdIcteridae1912025-30%1970
DickcisselCardinalidae822025-15%1970
Cliff SwallowHirundinidae502025+892%1999
Common NighthawkCaprimulgidae272025-56%1970
Mourning DoveColumbidae262025+35%1970
Cave SwallowHirundinidae202024-23%2012
Horned LarkAlaudidae122025-89%1970
Black-bellied Whistling-DuckAnatidae112025+440%1972
Fulvous Whistling-DuckAnatidae102019+188%1976
Eastern MeadowlarkIcteridae82025+250%1971
AnhingaAnhingidae81975n/an/a
Eurasian Collared-DoveColumbidae82025-6%2012
Painted BuntingCardinalidae72025-30%1970
Double-crested CormorantPhalacrocoracidae72016n/an/a
WilletScolopacidae52021n/an/a
White-faced IbisThreskiornithidae42015+39%1975
Scissor-tailed FlycatcherTyrannidae42025+42%1970
Northern MockingbirdMimidae42025-61%1970
Ash-throated FlycatcherTyrannidae42006+100%1999
Snowy EgretArdeidae32021+100%1976
Black-necked StiltRecurvirostridae32019+75%1972
KilldeerCharadriidae32025-50%1970
Lark SparrowPasserellidae32018-93%1970
House SparrowPasseridae32025-97%1970
Tricolored HeronArdeidae32019+200%1975
European StarlingSturnidae32025+270%2009
Crested CaracaraFalconidae32025+600%2001
Roseate SpoonbillThreskiornithidae32021+200%2003
Western Cattle-EgretArdeidae22021-76%1972
Rock PigeonColumbidae22025-50%1971
Turkey VultureCathartidae22025-75%1970
Purple MartinHirundinidae22021-27%1990
Green HeronArdeidae21992+33%1974
American CootRallidae21970n/an/a
Gull-billed TernLaridae21999+0%1995
Cassin's SparrowPasserellidae22014+50%1978
Mottled DuckAnatidae22023+58%1975
Great EgretArdeidae22021-29%1976

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