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PBS
Why We Only Have Ten Toes (It's a Long Story)
Today, all mammals from humans to bats have five fingers or fewer. Yes, even whales, whose finger bones are hidden in their fins. Birds have four or fewer and amphibians get the best of both worlds, often having four digits on their...
PBS
Pbs Learning Media: Fish With Fingers
In this video segment from Evolution: "Great Transformations," paleontologist Jenny Clack explains that vertebrates evolved fingers before they invaded land. [3:49]