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.

CASA GRANDE -- As bird flu has spread across 10 states, causing over 30 million chickens to be euthanized, quail breeders are seeing increased interest in alternatives.

Big cats are increasingly spotted near Washington, D.C., raising concerns among wildlife officials and residents. Experts believe habitat changes, shrinking food sources, and urban expansion are ...

Long Island’s last commercial duck farm is rebuilding after a bird flu outbreak forced the destruction of its entire 100,000-bird flock in January. The first wave of more than 900 ...

Chickens at a fourth commercial farm in Maricopa County tested positive for bird flu, the Arizona Department of Agriculture said.