Every now and again, our planet ponies up a fossil so spectacular that almost ... That includes the larva's brain, digestive glands, circulatory system, and nervous system. "It's always ...

Remember, "skeletons" include bone, the protein shell of crabs or insects, the sturdy shells of clams, or the massive rock secreted by coral. A. Apatite (calcium ... not been changed to another ...

But how the avian brain evolved over many millions of years from an ancestral dinosaurian form has long puzzled scientists. That has now changed thanks to a spectacular fossil discovery in Brazil.