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Ross's Goose, Christian Artuso
Photo © Christian Artuso

Photo: Christian Artuso
Breeding evidence - Ross's Goose
Breeding evidence

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Ross's Goose
Anser rossii
Landscape associations:

Click on plot to view table of mean abundance
Conserv. status:
SRANK: Uncommon to Widespread Breeder (S3S4B)
Number of squares
ConfirmedProbablePossiblePoint counts
0 1 3 1
Long-term BBS trends
RegionYearsTrend (conf. interv.) Reliab.
BBS trends are not available for this species

Mean abundance (number of birds detected per 5 min. point count) and percentage of squares occupied by region

Bird Conservation Regions [abund. plot] [%squares plot]
Arctic Plains and MountainsBoreal Hardwood TransitionBoreal Softwood Shield
Abund.%SquaresAbund.%SquaresAbund.%Squares
0.00% 0.00% 0.00%
Boreal Taiga PlainsPrairie PotholesTaiga Shield and Hudson Plains
Abund.%SquaresAbund.%SquaresAbund.%Squares
0.00% 0.00% 0.130%

Characteristics and Range At two-thirds the size of a Snow Goose, Ross's Goose is barely larger than a Mallard. It has a shorter and thicker neck than the Snow Goose and a shorter bill, which lacks a distinct "grinning patch", but is otherwise very similar. A dark (blue) morph of the species is extremely rare—it has been reported in the province only a handful of times—and might be a result of hybridization with Snow Geese (Jónsson et al. 2013). Ross's and Snow Geese often occur together on the breeding grounds, during migration, and on the wintering grounds. During migration, family parties of Ross's Geese are often found at the periphery of Snow Goose and Canada Goose flocks. Ross's Goose is primarily a High Arctic breeder, with largest numbers in the Queen Maud Gulf area and smaller colonies elsewhere in the Canadian Arctic and along the south and west shores of Hudson Bay. Most Ross's Geese winter in the Central Valley of California, but increasingly they are also found in south-central U.S.A. and northern Mexico (Jónsson et al. 2013).

Distribution, Abundance, and Habitat Only four surveyed squares were occupied, all in the vicinity of Cape Churchill (Taiga Shield & Hudson Plains). No confirmed breeding was reported. A large mixed Snow Goose and Ross's Goose colony at La Pérouse Bay was not visited during the atlas period, however, which no doubt resulted in the under-reporting of this species as a breeder in the province. Ross's Goose had first been found nesting there in 1972 and by 2003 perhaps 1,000 pairs were present (Jehl 2004). Breeding habitat consists of sparsely vegetated islands, areas around shallow lakes, and occasionally riparian habitat, above the treeline, often with Snow Geese (Jónsson et al. 2013). Increasing numbers are found in marshes and cropland in southern Manitoba during migration.

Trends, Conservation, and Recommendations Global population estimates increased dramatically from <6,000 birds in the early 1950s to >2,000,000 by 2013 (Jónsson et al. 2013). Conservation measures, including reduced hunting pressure, and especially increased winter food availability, have allowed it to reach its current abundance (Jónsson et al. 2013). Potential threats include poor quality breeding habitat (due to overgrazing), loss of wintering habitat, concentration of flocks at relatively few sites, and lead poisoning (Jónsson et al. 2013).

Rudolf F. Koes

Recommended citation: Koes, R. F. 2018. Ross's Goose in Artuso, C., A. R. Couturier, K. D. De Smet, R. F. Koes, D. Lepage, J. McCracken, R. D. Mooi, and P. Taylor (eds.). The Atlas of the Breeding Birds of Manitoba, 2010-2014. Bird Studies Canada. Winnipeg, Manitoba http://www.birdatlas.mb.ca/accounts/speciesaccount.jsp?sp=ROGO&lang=en [14 Dec 2018]

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Banner photo: Christian Artuso