Thousand Islands – Frontenac Arch is one of four ecoregions of the Mixedwood Plains. The Thousand Islands in the Saint Lawrence River have a distinctive flora and fauna and are a part of the biological corridor. The bedrock is mostly gneiss, granite and marble, more than a billion years old. The Frontenac terrain is the youngest of the Ontario portions of the arch, dated at 1.2 billion years old. These rocks were once part of a large mountain chain of the ancient supercontinent of Rodinia. There is also a meteor crater near Holleford, where the shield meets the limestone plains of southeastern Ontario. The area
North American river otter openings in the ice, and may excavate passages in beaver dams for accessing open water. North American river otters are highly mobile and have the capacity of traveling up to in one day. Daily movements of yearling males and females in Idaho averaged in spring, in summer, and in autumn, respectively. Daily movements of family groups averaged in spring, summer, and winter, respectively. Both males and family groups travel drastically less during winter. North American river otters are renowned for their sense of play. Otter play mostly consists of wrestling with conspecifics. Chasing is also a common game. North American