Call of Duty Black Ops: Cold War

CODENAME: ‘PERSEUS’

‘Bored’ ravens straying from Tower of London as tourist numbers fall

Legend warns monarchy and building will crumble if resident birds flee fortress

at least six ravens must remain lest both Tower and Monarchy fall.

https://www.theguardian.com/environment/2020/aug/20/bored-ravens-straying-tower-london-tourist-numbers-fall-legend-birds-monarchy

https://www.historic-uk.com/HistoryMagazine/DestinationsUK/Tower-Ravens/