The hair-net cocoon by Minghui Yuan, China. Standing side-on to the wall of the WC, his face and camera pressed againstit, Minghui focused on the remarkable cocoon of a Cyanamoth pupa. A more typical location would be a tree trunk or rock, as in the rainforest of Xishuangbanna, southwest China, where he had just been filming. But this caterpillar had chosen awall. It had used its long, hair-like setae to weave the delicate cocoon cage, held with silk and just 4 centimetres (11/2inches) long, inside which it would pupate. The cage must provide protection against some predators but probably not against the wasps that parasitize it. Once in its cage, the caterpillar spits out silk, spinning almost invisible threads to suspend itself, head first from the cage while it turns into a pupa. The cage has an aperture at either end, through which the caterpillar expels its outer layer after its final moult and then–once it has reorganized its body–emerges from the top as a beautiful white moth, decorated in red and black.