Just as human counts are incomplete, so are animal counts. But the first worldwide compilation of animal cases is a start at understanding the extent of human-to-animal transmission, scientists say.

Studies on white-tailed deer in Pennsylvania and Ontario offer evidence that the mammals are a reservoir for the coronavirus. What are the implications for the course of SARS-CoV-2?

A new study documents that infected hamsters, imported from the Netherlands, passed the virus on to humans. Previously only minks had been identified as a source of animal-to-human transmission.

Hong Kong's hamster cull has people wondering if they can catch SARS-CoV-2 from a pet. And here's a human dilemma: Is it risky to visit an immunocompromised individual who recently had COVID?

Hong Kong's government is directing anyone who bought a hamster in the past five weeks to surrender their pets for euthanasia after 11 of the animals tested positive for the coronavirus.

A hamster named Mr. Goxx enters one of two tunnels in the his cage, which determines whether he will buy or sell. As of Friday, his portfolio is up nearly 20%, according to his Twitter account.