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DECEMBER 2000 RARE BIRDS IN BRITAIN AND IRELAND

Text by Ken Arber

Bohemian Waxwing, Anglers CP, December 2000 © Paul Hackett


Richardson's Canada Goose Branta canadensis hutchinsii is a bird of the Canadian arctic, and is highly migratory spending the winter months mainly in southern Texas: with two groups located in the far west and around the coastal plain.

Lesser Canada Goose B. c. parvipes has a similar northerly breeding range that extends further west into central Alaska, it is also strongly migratory with a similar wintering range, although parvipes extends further north from Texas into the adjacent states. There are also groups wintering on theWashington/Oregon border and in northern and southern California.

The races of Canada Goose are clinal, with the smallest in the north and the palest in the east. Hutchinsii is the palest and the smallest of the pale forms. It is overall quite pale with an especially on the breast. Rarely a pale collar may be present, however, often the lower border of the dark neck may simply appear diffuse as paler feathers are admixed with the dark. Hutchinsii is known to intergade with parvipes in an overlap zone around Hudson Bay. Although parvipes is also pale breasted, it is not as pale overall. Bill size and shape is somewhat different in the two races: hutchinsii having a shorter deeper bill which appears stubby. The voices of the northern races are quite distinct and are variously described as being higher in pitch and "yelping" or "cackling" hence the common English name of Cackling Goose applied to the race minima. The populations of both parvipes and hutchinsii appear to be thriving.

Snow Goose, Parvipes & Richardsons Canada Geese, Islay Strathclyde, December 2000 © Paul Hackett


PAGE 2 OF DECEMBER 2000 - RARE BIRDS IN BRITAIN AND IRELAND

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