CK-12 Foundation
Ck 12: Biology: Cenozoic Era the Age of Mammals
[Free Registration/Login may be required to access all resource tools.] Covers the Cenozoic Era, the age of mammals.
Canadian Museum of Nature
Canadian Museum of Nature: Bowheads in Ontario?
This site looks into the possibility that Bowheads ranged as far south as the Ottawa Valley as fossils were found in White Lake Ontario where the Champlain Sea once was.
Canadian Museum of Nature
Canadian Museum of Nature: Giant Beaver
During the last age, the largest North American rodent was the Giant Beaver. It is profiled here.