I have written about this before. Driving from Palau to Castelló, across the Aiguamolls, a tsunami of starlings unfurls in the sky, and I am encompassed by their path. They wheel and return, settle in a paddock behind me, where there are horses. I park the car at the side of the road and film them on my phone. I have accepted the notion that they swarm in these glorious, rhythmically unfolding patterns out of sheer exuberance, and whenever I witness their aerial displays I am overwhelmed by a subtly swerving joy, and I understand a little better the urge to dance . . .