In this Thursday, May 21, 2020, file photo, Larry, the official 10 Downing Street cat, walks outside 10 Downing Street before the nationwide Clap for Carers to recognize and support National Health Service (NHS) workers and carers fighting the coronavirus pandemic, in London. Monday, Feb. 15, 2021, marks the 10th anniversary of rescue cat Larry becoming Chief Mouser to the Cabinet Office in a bid to deal with a rat problem at 10 Downing Street.