OXFORD, England, Aug. 13 (UPI) -- A radical shortening of their tails 100 million years ago gave the earliest birds versatile legs and an evolutionary edge, British paleontologists say.
A team led by Oxford University scientists examined fossils of the earliest birds from the Cretaceous Period, 145 million to 66 million years ago, and found the loss of their long bony tails, which occurred after flight had evolved, led to an explosion of diversity in the hind limbs of early birds.