A little over a year ago, Marcela Uhart was walking on the beach in Punta Delgada, Argentina. It was peak breeding session on this peninsula known for its rich marine wildlife. Usually, the salty ...

Researchers are reporting mass die offs of wild birds and sea mammals due to bird flu. They're tracking the deaths to better understand the virus and how it might create a greater threat to humans. An ...

Avian H5N1 took a big leap about four years ago. Previously the virus, first detected in the mid-1990s, would tear through domesticated poultry, killing off flocks in days. It occasionally jumped to ...

In the U.S., bird flu headlines have focused on an unprecedented number of American cases and the impact of the virus on dairy cows and on poultry. In this May 22, 2018 photo, ruddy turnstones, larger ...