in the North Pacific in the 12th century could have triggered the appearance of Tappanaga, causing short-finned pilot whales to colonize the colder ranges of the long-finned variant. Whales with similar characteristics to the Tappanaga can be found along Vancouver Island and northern USA coasts as well. See also Aquatic adaptation Evolution of mammals Evolution of sirenians List of extinct cetaceans Transitional form References External links For a review of whale evolution, see Timeline of Whale Evolution - Smithsonian Ocean Portal Cetacean Paleobiology – University of Bristol BBC: Whale's evolution BBC: Whale Evolution – The Fossil Evidence Hooking Leviathan by Its Past by Stephen Jay Gould Research on the Origin and Early Evolution of Whales (Cetacea), Gingerich, P.D., University of Michigan Pakicetus inachus, a new archaeocete (Mammalia, Cetacea) from the early-middle Eocene Kuldana Formation of Kohat (Pakistan). Gingerich, P.D., 1981, Museum of Paleontology, The University of Michigan Skeletons of terrestrial cetaceans and the relationship of whales to artiodactyls, Nature 413, 277–281 (20 September 2001), J. G. M. Thewissen, E. M. Williams, L. J. Roe and S. T. Hussain Evolution of Whales segment from the Whales Tohorā Exhibition Minisite of the Museum of New Zealand Te Papa Tongarewa Cetaceans Cetaceans Articles containing video clips