United States
£ GBP
There are eight currently recognized species of North American geese: emperor, greater white-fronted, snow, Ross's, Canada and cackling, barnacle, and brant geese. The North American Geese describes each species' geographic range and subspecies, its identification traits, weights and measurements, and criteria for its age and sex determination. Ecological and behavioural information includes each species' breeding and wintering habitats, its foods and foraging behaviour, its local and long distance movements, and its relationships with other species. Reproductive information includes each species' age of maturity, pair-bond pattern, pair-forming behaviours, usual clutch sizes and incubation periods, brooding behaviour, and postbreeding behaviour. Mortality sources and rates of egg, young, and adult losses are summarized, and the past and current populations of all species are estimated.
