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Dr. Lily Parkinson, a clinical veterinarian, splits a larger bag of blood from River, an 8-year-old clouded leopard, into smaller bags that match the sizes of different animals at Brookfield Zoo Chicago, in Brookfield, Ill., west of Chicago, Aug. 15, 2025. Parkinson, who wants to establish the nation?s first frozen blood bank for zoo and aquarium animals, is exploring whether red blood cells can be preserved for transfusions. (Jamie Kelter Davis/The New York Times/Fotoarena)
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