One of the eight famed ravens at the Tower of London is thought to have died, several weeks after going missing. A 300-year-old royal decree states that at least six ravens must be kept at the tower, in keeping with an omen that if the ravens leave, the kingdom will meet with disaster. There could be a less prophetic modern-day explanation for ravens spending less time at the tower, however. Under lockdown, without throngs of tourists, the intelligent ravens have become bored, and are straying further from the 900-year-old bastion to find amusement—and full bins—according to the Ravenmaster. The ravens at the tower can live for 25 years and are a popular fixture for tourists, some of whom are familiar with the birds by name. “Our much-loved raven Merlina has not been seen at the Tower for several weeks, and her continued absence indicates to us that she may have …