A bottlenose dolphin captured last month off the coast of western Japan has an extra set of fins,providing evidence that ocean-dwelling mammals once had four legs and lived on land, Japanese researchers said on November 5.
fisherman netted the four-finned dolphin off the coast of Wakayama state on October 28 and alerted the nearby Taiji Whaling Museum.
The second set of fins, much smaller than the dolphin's front fins, are about the size of adult human hands and protude from near the tail on the dolphin's underside