Teeth marks made on the leg bone of a large avian reptile known as a terror bird 13 million years ago suggest an even bigger ...

New versions of the H5N1 virus are increasingly adept at spreading. Suggestions to either let it rip in poultry or vaccinate the birds could backfire.

Last year, bird flu killed more than 40 million egg-laying birds. Including ducks and chickens, 148 million birds have been ordered euthanized since H5N1 began spreading around the U.S. in 2022 ...