Mississippi state and federal officials have confirmed an outbreak of a strain of bird flu not reported in the U.S. since 2017, with quarantine and depopulation efforts already underway.

When biologists first noticed increased bird flu cases in October, 49 cases had been reported. But because they can only test a limited number of carcasses, the true number is likely higher.

A new study investigates an ongoing epidemic in Bay Area peregrine falcons.

After a catastrophic outbreak of bird flu devastated southern elephant seal populations in 2023, scientists are on high alert.

The latest outbreak brings the total number of cases recorded in Lancaster County to nearly 6.1 million since the start of the year and 7.7 million statewide.

The confirmation last week of H5N1 bird flu in northern elephant seals at California’s Año Nuevo State Parkhas put wildlife ...