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Monarch caterpillar

Mass Audubon State of the Birds

Find Bird Groups

Swainson's Thrush
Catharus ustulatus

Only the highest areas of Berkshire and Franklin County host the Swainson's Thrush during the breeding season in Massachusetts, for it is a specialist of spruce and fir forests. This restricted population is sufficiently small to warrant close attention, especially because current population surveys are inconclusive.
Conservation Status
Monitor to Ensure Stability

Tracking This Bird In Massachusetts

Climate Vulnerability Score

Highly Vulnerable
Mass Audubon Mean likelihood of occurrence (current)
0.40
Mass Audubon Mean likelihood of occurrence (2050)
0.21
Mass Audubon Absolute change in likelihood of occurrence
-0.20
U.S. Forest Service Climate Change Bird Atlas (Hadly Hi emissions scenario)a
-0.50
National Audubon Societyb
n/a
a USFS model data for Massachusetts by 2100
b National Audubon Society's Climate Change Atlas was completed on a continental scale.

Breeding Bird Atlas

Atlas I Blocks
23
Atlas II Blocks
25
Percent of state occupied - Atlas I
2
Percent of state occupied - Atlas II
2
Percent change
105

Breeding Bird Survey

Annual trend 1966-2010
-7.3%
P-value
not significant
Number of routes
4
Recent trend 2000-2010
-6.7%

Christmas Bird Count

Trend (1963-2008)
0
Significantly different than zero
Trend (1963-1979)
0
Significantly different than zero
Trend (1979-2008)
0
Significantly different than zero

Habitat Usage

Breeding

Forest

Wintering

Does not winter in Massachusetts

Climate Suitability Current and 2050