They flit to and fro, perching on branches and leaves while they plan their next move. Sure, a quadcopter can land on the ground, but then it has to spend more energy getting back to altitude.
It was moved to the island in the 1950s from the docks at Cardiff. The move was overseen by foreman William Munn. It has recently been restored and often seen topped by a perching cormorant or heron.