Four lions at Barcelona Zoo have tested positive for coronavirus after being given Covid tests when a zookeeper noticed they were displaying suspicious symptoms. The lions were familiar enough with the zookeepers to allow them to swab their noses and mouths in the same way that humans are tested. Although it is not yet known how the lions contracted Covid, two human staff at the zoo have also tested positive. The zoo has contacted its counterparts at the Bronx Zoo in New York, where the first confirmed cases of Covid in large cats was reported. They all recovered. There have been cases of Covid in domestic dogs and cats and large outbreaks among mink around the world. It is not fully known which animals can and cannot contract Covid from contact with infected humans, and no confirmation of animals re-infecting humans.