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Find a Bird

Great Cormorant
Phalacrocorax carbo

The Great Cormorant is most often encountered in migration and during the winter, although a few immatures regularly linger into summer along the coast. Its breeding distribution is very restricted, with only a single confirmed breeding record for Massachusetts. Control of the eastern Canadian population as a pest species may be responsible for dropping winter numbers.
Conservation Status
Trend not established

Tracking This Bird In Massachusetts

Climate Vulnerability Score

No data
Mass Audubon Mean likelihood of occurrence (current)
Mass Audubon Mean likelihood of occurrence (2050)
Mass Audubon Absolute change in likelihood of occurrence
no data
U.S. Forest Service Climate Change Bird Atlas (Hadly Hi emissions scenario)a
No data available
National Audubon Societyb
No data available
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
0
Atlas II Blocks
3
Percent of state occupied - Atlas I
0
Percent of state occupied - Atlas II
0
Percent change
0

Breeding Bird Survey

Annual trend 1966-2010
-4.4%
P-value
not significant
Number of routes
9
Recent trend 2000-2010
-3.3%

Christmas Bird Count

Trend (1963-2008)
3.3
Significantly different than zero
yes
Trend (1963-1979)
22.2
Significantly different than zero
yes
Trend (1979-2008)
-2.4
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

Coastal

Wintering

Coastal