Researchers deflate evidence for cold-blooded dinosaurs
Life stories written in mammal bones are being used to debunk a key argument for cold-bloodedness in dinosaurs.
Annual growth lines etched in the femurs of 115 wild warm-blooded mammals such as giraffes, reindeer and gazelles are similar to those previously seen in the bones of dinosaurs and other reptiles, researchers report online June 27 in Nature.
“People always said that mammals do not show these lines,” says study lead author Meike Köhler, a paleontologist at the University of Barcelona in Spain. This assumption is “like a myth that’s going around; you read it everywhere,” she says. “But