Wildlife in Forest Park is strongly affected by contiguous tracts of nearby habitat that make the park accessible to birds and animals from the Tualatin River valley, the Oregon Coast Range, the Willamette River, Sauvie Island, the Columbia River, and the Vancouver, Washington, lowlands [REF].
Pressure from habitat loss, pollution, hunting, and urban development has reduced or eliminated the presence of wolves, bears, and wild cats and has led to increased numbers of weasels, raccoons, and other small predators.