“Early bird” Archaeopteryx may not be a bird after all
Published on October 13th, 2009 | by Admin1
Dr. Erickson said in an interview that studied under a polarizing microscope, the dense microstructure of the bone showed few traces of blood vessels. He said this was evidence of a slow metabolism by which the individual probably took more than two years to reach adult size. Birds have especially fast metabolisms, making them able to leave the nest in days or a few weeks.
Mark A. Norell, a co-author who specializes in dinosaur research at the American Museum of Natural History in New York, said the findings showed that “the transition to physiological and metabolic birds happened well after Archaeopteryx.” As a result, he added, the evolutionary emergence of birds “is still a huge mystery.”