Mass Audubon State of the Birds
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State of the Birds
American Crow
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Tracking This Bird In Massachusetts
Climate Vulnerability Score
Least Vulnerable
Mass Audubon Mean likelihood of occurrence (current)
0.52
Mass Audubon Mean likelihood of occurrence (2050)
0.50
Mass Audubon Absolute change in likelihood of occurrence
-0.01
U.S. Forest Service Climate Change Bird Atlas (Hadly Hi emissions scenario)a
-12.70
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.
Mass Audubon indicates least vulnerable to climate change. USFS indicates decline. Results not presented by National Audubon.
Breeding Bird Atlas
Atlas I Blocks
870
Atlas II Blocks
990
Percent of state occupied - Atlas I
89
Percent of state occupied - Atlas II
95
Percent change
103
Breeding Bird Survey
Annual trend 1966-2010
1.4%
P-value
significant, increasing
Number of routes
27
Recent trend 2000-2010
-0.6%
Christmas Bird Count
Trend (1963-2008)
2
Significantly different than zero
yes
Trend (1963-1979)
3
Significantly different than zero
no
Trend (1979-2008)
1
Significantly different than zero
no
Christmas Bird Count Sightings By Year
Data reflects sightings per person per hour in order to account for varying numbers of yearly volunteers.
Habitat Usage
Breeding
Forest, Urban and Suburban
Wintering
Urban and Suburban