Their deaths came within a day of each other, the Chicago zoo said in a Jan. 15 news release. Teal, a months-old Chilean flamingo, died Jan. 8 and Slater, a 7-year-old harbor seal, died Jan. 9.

The sources of exposure are unclear, but officials said it was almost certainly from contact with an infected waterfowl.

Officials at Lincoln Park Zoo confirmed Wednesday that a harbor seal and a Chilean flamingo each died of highly pathogenic avian flu earlier this month. In a statement, zoo officials said the