 Archeologists have found the bones of wolf, beaver, deer, elk, grey seal ("Halichoerus grypus"), the Indian dog, and the extinct sea mink ("Neovison macrodon"), as well as large numbers of raccoon, lynx, and muskrat.Although beaver were trapped to extinction on the island, two pairs of beaver that were released in 1920 by George B. Dorr at the brook between Bubble Pond and Eagle Lake have repopulated it.The large fire in 1947 cleared the eastern half of the island of its coniferous trees and permitted the growth of aspen, birch, alder, maple and other deciduous trees which enabled the beaver to thrive.