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)
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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)
