Dr. Dominique Keller, chief veterinarian, holds an experimental influenza vaccine prior to administering to a group of California condors at the Los Angeles Zoo, on Tuesday, Aug. 15, 2023. Antibodies found in early results of a historic new vaccine trial are expected to give endangered California condors at least partial protection from the deadliest strain of avian influenza in U.S. history. (AP Photo/Richard Vogel)
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