A couple of days ago Jo found a Red Admiral Vanessa atalanta caterpillar embarking on its pupation. This transformation was remarkably rapid. I photographed the caterpillar in the evening and the following day the chrysalis had formed, and by today it has hardened.
Inside that chrysalis the caterpillar will be breaking down and then reforming into a butterfly, in what is surely one of the most remarkable processes in the natural world. I think that it will take a couple of weeks for the adult butterfly to emerge. Whether I will be lucky enough to see it is another matter, but I will provide an update whatever the outcome.