Four-finned Japanese dolphin an evolutionary throwback, researchers say Divers with the four-finned dolphin. (Mainichi) A bottlenose dolphin captured last month off western Japan has an extra set of fins, providing further evidence that ocean-dwelling mammals once had four legs and lived on land, Japanese researchers said Sunday.Fishermen netted the four-finned dolphin off the coast of Wakayama Prefecture on Oct. 28, and alerted the nearby Taiji Whaling Museum, according to museum director Katsuki Hayashi.The second set of fins -- much smaller than the dolphin's front fins -- are about the size of adult human hands and protrude from near the...
