Species · Illinois · BBS 2025 Release · 1966–2024
Yellow-crowned Night Heron Population Trend in Illinois
Yellow-crowned Night Heron in Illinois has fallen sharply: down 69% on the route-weighted index since 1974.
-69%Since 1974
6Routes In State
17Years
Notable Yellow-crowned Night Heron Trends in Illinois
long arc declinecomputed index
Yellow-crowned Night Heron has fallen sharply in Illinois: down 69% on the route-weighted index since 1974.
Yellow-crowned Night Heron Survey Routes in Illinois
| Chandlervill | 6 | 1974 | 1974 |
| Belknap | 5 | 1981 | 1981 |
| Pulaski | 3 | 2011 | 1971 |
| Belleview | 1 | 2021 | 2021 |
| Birds | 1 | 1981 | 1981 |
| Beaverdam Lk | 1 | 1986 | 1972 |
Yellow-crowned Night Heron Population Trend in Other States
Source: USGS North American Breeding Bird Survey, retrieved 2026-05-22.