BirdAnalyst
BBS Route · Texas · BCR 19

Mertzon 2 Bird Survey Route

A standard 50-stop Breeding Bird Survey route. 47 species recorded across 3 survey years, still active.

47Species 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 →
3Years SurveyedYears surveyedNumber of years with at least one standard-protocol run in this geography. A longer record makes the trend more reliable.Full methodology →
2022–2025Span
2Observers

Bird Species Found on Texas Mertzon 2

Top 40 of 47 species by most recent count. Each links to its species trend.

Species recorded on the Mertzon 2 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
Turkey VultureCathartidae472025+88%2022
Northern MockingbirdMimidae312025+0%2022
Cassin's SparrowPasserellidae222025+633%2022
Northern CardinalCardinalidae212025+50%2022
Painted BuntingCardinalidae192025-10%2022
Mourning DoveColumbidae162025+167%2022
Lark SparrowPasserellidae152025+36%2022
Bell's VireoVireonidae142025-18%2022
Ash-throated FlycatcherTyrannidae132025+117%2022
Black-throated SparrowPasserellidae82025+167%2022
Bewick's WrenTroglodytidae82025+700%2022
Northern BobwhiteOdontophoridae72025+133%2024
Scissor-tailed FlycatcherTyrannidae62025-25%2022
Common RavenCorvidae52025+150%2022
Blue GrosbeakCardinalidae52025+400%2022
Barn SwallowHirundinidae52025n/an/a
Common NighthawkCaprimulgidae42024n/an/a
Golden-fronted WoodpeckerPicidae32025+50%2022
Cactus WrenTroglodytidae32022n/an/a
Yellow-breasted ChatIcteriidae32025n/an/a
Black VultureCathartidae22025+100%2022
Ladder-backed WoodpeckerPicidae22025+100%2022
Western KingbirdTyrannidae22025+100%2022
Black-crested TitmouseParidae22024+0%2022
Vermilion FlycatcherTyrannidae22024n/an/a
Bullock's OrioleIcteridae22025+100%2024
House FinchFringillidae22025-60%2024
American CrowCorvidae12022n/an/a
Brown-headed CowbirdIcteridae12025-75%2022
Scott's OrioleIcteridae12025-50%2022
Orchard OrioleIcteridae12025-80%2022
PyrrhuloxiaCardinalidae12025-92%2022
KilldeerCharadriidae12024n/an/a
Greater RoadrunnerCuculidae12024n/an/a
Yellow-billed CuckooCuculidae12024n/an/a
Common GrackleIcteridae12025-50%2024
Summer TanagerCardinalidae12024n/an/a
Carolina WrenTroglodytidae12024n/an/a
American RobinTurdidae12025+0%2024
Eurasian Collared-DoveColumbidae12025-80%2024

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