Public transport bosses in northwest England on Tuesday clarified the rules on face coverings after a bus passenger was spotted with a snake around his neck and mouth.The commuter was spotted on a bus bound for Manchester on Monday but fellow passengers initially believed he was wearing a colourful face covering, the Manchester Evening News reported.“At first I thought he had a really funky mask on, then he let it crawl around the hand rails,” one witness was quoted as saying.“No one was really…