BirdAnalyst
Species · Massachusetts · BBS 2025 Release · 1966–2024

Mute Swan Population Trend in Massachusetts

All statesWaterfowl

Mute Swan in Massachusetts has surged: up 93% on the route-weighted index since 1981.

+93%Since 1981
11Routes In State
23Years

Notable Mute Swan Trends in Massachusetts

long arc increasecomputed index

Mute Swan has surged in Massachusetts: up 93% on the route-weighted index since 1981.

Mute Swan Population Forecast in Massachusetts

If the recent trend holds, Mute Swan in Massachusetts is projected to rise about 16% by 2029 — from 0.27 in 2024 to a central estimate of 0.31 (95% range 0.03–0.59). A 5-year backtest shows a typical error of ±81.2%, with 100% of held-out values landing inside the 95% band.

+16%Change by 2029
0.31Projected 2029 index
0.03–0.5995% range
±81.2%Backtest error
19712029
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
20250.290.010.57
20260.300.020.57
20270.300.020.58
20280.310.030.58
20290.310.030.59

Mute Swan Survey Routes in Massachusetts

Routes recording Mute Swan in Massachusetts.
Brockton319921992
Chilmark219831971
Marion220241998
Littleton220112011
Mansfield220161999
Holden220182009
N. Andover220242024
E Dennis120112001
Maynard120172017
Wellfleet 2120172017
Warren 2120182018

Mute Swan Population Trend in Other States

californiaconnecticutdelawareillinoisindianakentuckymarylandmichiganminnesotanew-hampshirenew-jerseynew-yorkohiopennsylvaniarhode-islandvirginiawisconsin

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