epa11859277 Wild waterfowl, including Mute Swans, Cygnus olor, Canada Geese, Branta canadensis, and Mallards, Anas platyrhynchos, flock on Hagar Pond in Marlborough, Massachusetts, USA, 28 January 2025. Several dead birds have been collected from the pond and although a recent outbreak of avian flu, H5n1, has been detected in Massachusetts, the CDC has only...

epa11859273 Signage warns passers-by not to touch or move dead waterfowl at Hagar Pond in Marlborough, Massachusetts, USA, 28 January 2025. Several dead birds have been collected from the pond and although a recent outbreak of avian flu, H5n1, has been detected in Massachusetts, the CDC has only reported one recent human fatality in 2024. EPA/CJ GUNTHER