BirdAnalyst
Species · BCR 29 · BBS 2025 Release · 1966–2024

Black-crowned Night Heron In Piedmont

All regionsPiedmontWetland birds

Black-crowned Night Heron in Piedmont has fallen sharply: down 72% on the route-weighted index since 1974.

-72%Since 1974
17Routes In Region
46Years

Notable Signals

long arc declinecomputed index

Black-crowned Night Heron has fallen sharply in Piedmont: down 72% on the route-weighted index since 1974.

Forecast

If the recent trend holds, Black-crowned Night Heron in Piedmont is projected to stay roughly flat through 2029, near 0.00 (95% range 0.00–0.15). A 5-year backtest shows a typical error of ±110.3%, with 100% of held-out values landing inside the 95% band.

n/aChange by 2029
0.00Projected 2029 index
0.00–0.1595% range
±110.3%Backtest error
19702029
Projection of the recent trend (dashed) with 80/95% bands — a projection, not a prediction. Habitat, climate, and land use are not modeled.
YearProjected index95% low95% high
20250.000.000.15
20260.000.000.15
20270.000.000.15
20280.000.000.15
20290.000.000.15

Routes In Piedmont

Routes recording Black-crowned Night Heron in Piedmont.
EphrataPENNSYLVANIA51981
IjamsvilleMARYLAND22023
FairviewNORTH-CAROLINA22008
Sporting HilPENNSYLVANIA21977
Nixburg 2ALABAMA12001
Lincolnton 2GEORGIA12019
OlneyMARYLAND12024
TheodoreMARYLAND12010
WheatonMARYLAND12024
Mt GretnaPENNSYLVANIA11991
PottstownPENNSYLVANIA11979
LabottPENNSYLVANIA11979
Mount JoyPENNSYLVANIA11996
BendersvillePENNSYLVANIA12010
JacobusPENNSYLVANIA12015
LeolaPENNSYLVANIA12023
HallVIRGINIA12006

Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.