Riding along by the river on Monday, I saw a flotilla of swans swimming along. There were five of them and their different progresses reminded me of a group of cyclists. First came one on his/her own (I'm sure I used to know how to tell male from female swans, something to do with their beaks), swimming strongly, creating a great V-shaped wake and increasing his lead over the group. Then some way behind was a group of two, side by side chatting. Just behind them another, keeping up. And at the back a last solo bird, swimming at a reasonable pace but looking around, veering off to the side to investigate things on the river bank, stopping to eat, and as a consequence dawdling ever further behind.