‘Bored’ ravens straying from Tower of London as tourist numbers fall
Legend warns monarchy and building will crumble if resident birds flee fortress
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/