Tests show bird flu caused the death of a 21-year-old harbor seal at a zoo in New Bedford, Massachusetts earlier this month. The Buttonwood Park Zoo said in a social media post that the "beloved" seal named Blue likely got the avian flu by coming into contact with an infected wild bird.

Blue, a 21-year-old harbor seal, is believed to have contracted the virus through contact with a wild bird, zoo officials said.

Buttonwood Park Zoo officials have confirmed that Blue, a 21-year-old harbor seal, died this month due to complications from the avian flu, or bird flu. Zoo officials say it's the second case of a death from avian flu at the zoo. A swan goose died at the zoo on Jan. 27.