Animal coronaviruses include mammalian coronaviruses and avian coronaviruses. Mammalian coronaviruses are mainly from genus a and β coronaviruses, which can infect a variety of animals such as bats, pigs, dogs, cats, rats, cattle, horses, camels, hedgehogs, etc. Avian coronaviruses mainly originate from γ and δ genus coronaviruses, which can infect such as chickens, sparrows, ducks, geese, pigeons and many other avian birds.