This is a list of the mammal species recorded in Canada. There are approximately 200 mammal species in Canada. Its large territorial size consist of fifteen terrestrial and five marine ecozones, ranging from oceanic coasts, to mountains to plains to urban housing, mean that Canada can harbour a great variety of species, including nearly half of the known cetaceans.. The largest marine ecozone is the Arctic Archipelago whereas the terrestrial ecozone is the Boreal Shield. The most well represented order is that of the rodents, and the smallest that of the Didelphimorphia (common opossums).