That ancestor was a group called the lobe-finned fish, or sarcopterygians. One kind of ancient lobe-finned fish is Tiktaalik. They’re extinct now, but scientists think they lived about 375 ...

The animal was a so-called lobe-finned fish that lived about 375 million years ago. Named Tiktaalik rosae by its discoverers, it is a classic example of a transitional form, one that bridges the ...