Poultry on a commercial farm in England have been infected with the bird flu virus, the U.K. government said Sunday. The H5N1 virus was found in kept birds in St. Ives, a seaside town in Cornwall.

At other times it moves about boldly in the open, jerking its long tail expressively. Most catbirds winter in the southern United States or the tropics, but a few linger far to the north if they have ...