Kyan, one of Brookfield Zoo’s servals, receives a COVID-19 vaccine from Dr. Mike Adkesson, vice president of clinical medicine for the Chicago Zoological Society. He is assisted by Maggie Chardell, a lead animal care specialist. Due to the respectful and trusting relationships developed between the animals and the care staff, many of the zoo’s animals voluntarily participate in their own health care, including holding still while the vaccination is administered. (Cathy Bazzoni/CZS-Brookfield Zoo)