The Oakland Zoo in California started this week with bears, mountain lions, tigers and ferrets, the first of about 100 animals that are set to receive an experimental vaccine against the coronavirus over the summer. Zoetis, a veterinary pharmaceutical company, is donating 11,000 doses of the vaccine to about 70 zoos as well as sanctuaries, universities and other animal conservation sites in 27 U.S. states, and the Oakland Zoo is one of the first to benefit. The vaccine is solely for animals, goes through a different approval process than for people, and cannot be used to protect humans. “It means...