Bird flu has been spreading undetected in cows and vets, according to US CDC report
Avian influenza (H5N1) has been spreading in the United States among dairy cows since last year. View on euronews ...
150-million-year-old fossil shows early bird diversification in the Jurassic Period
The bird has a short tail ending in a pygostyle, an important aerodynamic innovation moving the center of mass forward toward ...