Illustration by Amanda Kahl Extinct North American species and those that exist today are juxtaposed near the North and South Bubble mountains in Acadia National Park. Clockwise from top left: a musk ox, short-faced bear, woodland caribou, American lion, giant beaver and woolly mammoth, with today’s moose. At the end of the last Ice Age, read more Thinking Big: Protecting Ecosystems Could Begin with the Restoration of the Largest Species – Gill