I've seen something I've never seen before in London, and for that matter only a handful of times elsewhere: a swarm of starlings, whirling and reforming over a sunset Wandsworth Bridge.

Amazing to watch. Like watching a cloud of iron filings pulled this way and that by unseen magnets.

One of my abiding memories of France is seeing huge swarms every evening ripping and bending in great vortices over Vichy. To see the same thing in the very heart of London was heart-stopping.

With the peregrine falcons nesting and dive-bombing by Tate Modern and now this, it's obvious that London still is red in tooth and claw.