24 Million Generations! Evolutionary Change in Body Size on Earth --From Mouse to Elephant

dailygalaxy.com — Evolutionary changes in body size take a very long time. A mouse-to-elephant size change would take at least 24 million generations based on the maximum speed of evolution in the fossil record, Becoming smaller can happen much faster than becoming bigger: the evolution of pygmy elephants took 10 times fewer generations than the equivalent sheep-to-elephant size change. New research also shows it took about 10 million generations for a cat-sized terrestrial mammals to evolve into the size of an elephant. Sea mammals, such as whales took about half the number of generations to hit their maximum Jan 31, 2012 View in Crawl 4