greater canada goose

The black head and neck with a white "chinstrap" distinguish the Canada Goose from all other goose species, with the exception of the Barnacle Goose, but the latter has a black breast, and also grey, rather than brownish, body plumage.[7] There are seven subspecies of this bird, of varying sizes and plumage details, but all are recognizable as Canada Geese. Some of the smaller races can be hard to distinguish from the Cackling Goose, which slightly overlap in mass. However, the Cackling Goose is usually considerably smaller, scarcely larger than a Mallard with a much shorter neck and smaller bill.

This species ranges from 75 to 110 cm (30 to 43 in) in length and has a 127–185 cm (50–73 in) wingspan.[8] The male usually weighs 3.2–6.5 kg (7.1–14 lb), and can be very aggressive in defending territory. The female looks virtually identical but is slightly lighter at 2.5–5.5 kg (5.5–12 lb), generally 10% smaller in linear dimensions than its male counterpart, and has a different honk. Among standard measurements, the wing chord can range from 39 to 55 cm (15 to 22 in), the tarsus can range from 6.9 to 10.6 cm (2.7 to 4.2 in) and the bill can range from 4.1 to 6.8 cm (1.6 to 2.7 in). The largest subspecies is the B. c. maxima, or the "Giant Canada Goose", and the smallest (with the separation of the Cackling Goose group) is B. c. parvipes, or the "Lesser Canada Goose".[9] An exceptionally large male of race B. c. maxima, which rarely exceed 8 kg (18 lb), weighed 10.9 kg (24 lb) and had a wingspan of 2.24 m (7.3 ft). This specimen is the largest wild goose ever recorded of any species. The life span in the wild of geese that survive to adulthood ranges 10–24 years.[10]