Bird puzzle solved

Did birds evolve independently or from dinosaurs? The question has been settled by a recent discovery; the findings are published in the latest issue of Science. A ten-foot long, nearly complete fossil discovered in 160-million-year old mudstone beds in northwest China provides indisputable evidence that birds evolved from dinosaurs. The young adult fossil is clearly … Continue reading Bird puzzle solved


Editorial: Oldest four-legged animals

Our understanding of when fishes evolved into tetrapods — animals with a backbone and four limbs — and began to walk on land needs radical revision. A study published recently in the journal Nature provides convincing evidence that the first vertebrates started walking nearly 385 million years ago — about 18 million years earlier than … Continue reading Editorial: Oldest four-legged animals