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FILE - Harbor seals keep watch from a small island off Portland, Maine, in this July 30, 2020 file photo. The problem of bird flu jumping from birds to marine mammals, such as seals, is worse than initially thought, scientists say. (AP Photo/Robert F. Bukaty, file)
FILE - Dead sea lions are seen on an Atlantic Patagonian beach near Viedma, Río Negro province, Argentina, in this Aug. 28, 2023, file photo. Bird flu is killing sea mammals from New England to Chili. (AP Photo/Juan Macri, files)
FILE - A gray seal swims in Casco Bay, off Portland, Maine, in this Sept. 15, 2020 file photo. Seal die-offs from the bird flu have been detected everywhere from New England to Chile. (AP Photo/Robert F. Bukaty, files)
Dead elephant seals line the beach at Punta Delgada, Chubut, Argentina, on Oct. 10, 2023. Bird flu has killed tens of thousands of seals and sea lions around the world and scientists aren't sure how to stop it. (Ralph Vanstreels/UC Davis via AP)
FILE - A young harbor seals rests on a small island in Casco Bay, off Portland, Maine, in this Sept. 16, 2020 file photo. Avian influenza is killing tens of thousands of seals and sea lions in different corners of the world, disrupting ecosystems and challenging scientists who don't see a clear way to slow the devastating virus. (AP Photo/Robert F. Bukaty, files)
Dead elephant seals line the beach at Punta Delgada, Chubut, Argentina, on Oct. 10, 2023. Bird flu has killed tens of thousands of seals and sea lions around the world and scientists aren't sure how to stop it. (Ralph Vanstreels/UC Davis via AP)
FILE - A gray seal surveys it's surroundings on a ledge off the coast of Camden, Maine, in this April 25, 2011 file photo. Scientists are working to understand how to deal with the dangers to the seal population caused by bird flu. (AP Photo/Robert F. Bukaty, files)
FILE - A baby harbor seal rest of Eastern Egg Rock off the coast of Maine in this July 9, 2007 file photo. Seal die-offs from the bird flu have been detected everywhere from New England to Chile. (AP Photo/Robert F. Bukaty, file)