The Cackling Goose has recently been elevated to full species rank separate from Canada Goose ( Peterson Field Guide To Birds of North America) Told from Canada by smaller size . shorter neck, smaller, rounder head , stubbier bill and higher-pitched voice, This one was among as many as five viewed today in Ottawa Ontario Canada. When in the company of a large grouip of Canada Geese they can be tough to find but once you see one next to a Canada Goose the differences are quite obvious.