In this undated photo provided by the Schoenbrunn Zoo a flock of pelicans is pictured at the zoo in Vienna, Austria. The zoo has euthanized its flock of 20 Dalmatian pelicans after examinations showed them infected with bird flu. A statement says the birds were put down Friday, March 10, 2017, a day after the first one was found with the disease. (Photo by Daniel Zupanc/Schoenbrunn Zoo via AP Photo)
