Birds that USFWS sent in from the Yukon Delta National Wildlife Refuge (NWR) for testing for highly pathogenic avian influenza (HPAI) have tested positive. Sabines gulls, glaucous gulls, and black brant all tested positive for HPAI.

"Since about May 25, crews have been seeing multiple species showing what we believe are signs of highly pathogenic avian influenza. The signs we are seeing widespread is a headshaking that we equate to "getting the cobwebs out", like a person may do when they first wake up. This behavior occurs regularly every couple minutes. This behavior has been observed in: black brant, cackling geese, bar-tailed godwits, dunlin, lapland longspurs, spectacled eiders, emperor geese, greater white-fronted geese, sabines gulls, glaucous gulls, and red-necked phalaropes."

For decades, the crowds of small, dark sea geese on the tundra of southwestern Alaska's Yukon-Kuskokwim Delta have been thinning, a situation opposite that of geese on the North Slope.

Black brant populations are struggling in the species' once-dominant Yukon-Kuskokwim Delta breeding areas, but conditions are better for brant breeding on the Arctic coastline.