Body coverings such as hair and feathers have played a central role in evolution. They enabled warm-bloodedness by insulating ...

Stretching 710 miles across Texas, the Trinity River is a vital habitat for a diverse variety of wildlife. With its forests, ...

A 13-million-year-old leg bone from an enormous flightless bird carries crocodilian tooth marks, showing South America was ...

Researchers have found evidence of a titanic tussle between a terror bird and a large caiman in Colombia's ancient La Venta ...