An excellent Nova episode from a few months ago takes a look at the evolutionary development of whales. A good film reviewed here looked at this amongst other developments in natural history. This year’s tv experience goes to the Egyptian Sahara to hunt for fossilized whales in what was once a shallow sea.
Note the image (By Nobu Tamura email:nobu.tamura@yahoo.com http://spinops.blogspot.com/ – Own work, CC BY-SA 4.0, https://commons.wikimedia.org/w/index.php?curid=51409887) of the reconstruction of Ambulocetus from 48 million years ago in what is today Pakistan. Isn’t it cute?