The Adirondack Park is home for 54 species of mammals. White- tailed deer are abundant, and there are more black bears in the Adirondacks than in any other part of the state. Forest residents that usually escape detection include bobcat, fisher, and pine marten. Working mostly after the sun goes down, beaver make their mark throughout the Adirondacks by damming most of the smaller streams. The song of the coyote is a common sound of the night. Wildlife biologists believe that coyotes migrated to the Adirondacks from the midwest and Canada during this century. An even more recent migrant is the moose. A small herd of wanderers from Vermont and New Hampshire has become established in the central Adirondacks over the past two decades. In the spring, throngs of migrating songbirds returning from their southern wintering grounds add color and music to the Adirondack environment. Mergansers dive for fish in remote ponds and lakes, while great blue herons stand alert in the shallows. At night the wild call of the loon is joined by the distinctive hoot of the barred owl. In all, almost 200 species of birds breed within the Adirondack Park.