A fox leaves his scent on the Christmas tree which is next to the front door of 10 Downing Street in London, Tuesday, Dec. 12, 2023. Foxes have an acute sense of smell, and scent plays a pivotal role in vulpine society. Foxes live in most central London parks, St James' Park backs onto the rear of Downing Street, and are regular visitors to the famous street. (AP Photo/Kin Cheung)