For the BioMystery this month we feature a part of some living creature, but do these structures come from a plant or animal? As you see, these structures are quite large (some up to 9 cms in length). They were purchased in a market in Manaus, a large city by the banks of the Amazon in central Brazil, so they must have some use either as food or for some other purchase. Any ideas? See page 366 at the back of this issue for the answer.