<P> The American marten or American pine marten (Martes americana) is a North American member of the family Mustelidae, sometimes referred to as the pine marten . The name "pine marten" is derived from the common but distinct Eurasian species of Martes . It differs from the fisher (Pekania pennanti) in that it is smaller in size and lighter in colour . </P> <P> The American marten is broadly distributed in northern North America . From north to south its range extends from the northern limit of treeline in arctic Alaska and Canada to northern New Mexico . From east to west its distribution extends from Newfoundland and south west to Napa County, California . In Canada and Alaska, American marten distribution is vast and continuous . In the western United States, American marten distribution is limited to mountain ranges that provide preferred habitat . Over time, the distribution of American marten has contracted and expanded regionally, with local extirpations and successful recolonizations occurring in the Great Lakes region and some parts of the Northeast . The American marten has been reintroduced in several areas where extinction occurred . </P> <P> The marten lives in mature coniferous or mixed forests in Alaska and Canada, the Pacific Northwest of the United States and south into Northern New England and through the Rocky Mountains and Sierra Nevada . Small groups of martens live in the Midwest in Minnesota and Wisconsin . Trapping and destruction of forest habitat have reduced its numbers, but it is still much more abundant than the larger fisher . The Newfoundland subspecies of this animal (Martes americana atrata) is considered to be threatened . </P> <P> Compared to other carnivores, American marten population density is low for their body size . One review reports population densities ranging from 0.4 to 2.5 individuals / km . Population density may vary annually or seasonally . Low population densities have been associated with low abundance of prey species . </P>

What is the habitat of a pine marten