In humans the pandemic is showing signs of ebbing. In white-tailed deer and other wildlife, however, infections appear widespread. In 2020, Denmark culled millions of mink to quell a source of zoonotic COVID-19 transmission, the passage of the SARS-CoV-2 virus between humans and animals. Last year, zoo animals including lions, tigers, and gorillas got sick with the virus, presumably infected by their keepers. And earlier this year, pet hamsters were implicated in precipitating a new outbreak in Hong Kong.