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Monarch caterpillar

Mass Audubon State of the Birds

Find a Bird

Chestnut-sided Warbler
Dendroica pensylvanica

Like a number of other early-successional breeding species, overall population declines of Chestnut-sided Warblers seem to conflict with the birds' stable distribution figures. The Breeding Bird Atlas data tells us that Chestnut-sided Warblers are still widespread (they breed in many different places across the state), but the actual number of birds has dropped significantly according to the Breeding Bird Survey.
Conservation Status
Continued Action/Monitoring Needed

Tracking This Bird In Massachusetts

Climate Vulnerability Score

Highly Vulnerable
Mass Audubon Mean likelihood of occurrence (current)
0.52
Mass Audubon Mean likelihood of occurrence (2050)
0.14
Mass Audubon Absolute change in likelihood of occurrence
-0.38
U.S. Forest Service Climate Change Bird Atlas (Hadly Hi emissions scenario)a
n/a
National Audubon Societyb
Climate Threatened
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
520
Atlas II Blocks
555
Percent of state occupied - Atlas I
54
Percent of state occupied - Atlas II
54
Percent change
93

Breeding Bird Survey

Annual trend 1966-2010
-1.9%
P-value
significant, declining
Number of routes
25
Recent trend 2000-2010
-1.7%

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

Shrubland

Wintering

Does not winter in Massachusetts

Climate Suitability Current and 2050