Dolphins With Legs

Maybe those Darwin fish are right after all:

TOKYO (AP) - Japanese researchers said Sunday a bottlenose dolphin captured last month has an extra set of fins that could be the remains of back legs, providing further evidence ocean-dwelling mammals once lived on land.

How do the scientist know that these are legs from the past and not legs from the future? Maybe they're evolving into land creatures. They could be the next trendy pet.