When the title of a pro-evolution article starts with the words 'Tale of 2 Tails,' we would expect to be treated to an intriguing, yet speculative Darwinian story.
This is what recently happened at Live Science.
Marine creatures, we are told, do not swim in the same way. Whales evolved from mammals that lived on land. They move their tails up and down. Sharks, in contrast, are fish, so they move their tails from side to side.
This is how Kenneth Lacovara, a professor of paleontology and geology at Rowan University, explains the difference.