Two of the most common recurring themes on Moche/Mochica culture pottery are depictions of anthropomorphic birds, animals and lima beans. These themes played prominent roles in ceremonies and everyday life. Birds were precious resources in the economy of Andean societies. Merchants traded brilliantly colored parrot and macaw feathers in long-distance networks connecting the Amazonian rainforest, the Cordillera, and the remote Pacific coast, where they decorated garments of rulers and kings. Coastal agriculturalists used guano to enrich their fields. Sailors collected the valuable fertilizer offshore on sacred islands, where they left prestigious offerings. On the coast, domesticated muscovy ducks may have been part of the subsistence. One of the frequently recurring themes in Moche art is the race between human beings with the features of animals, carrying bags with lima beans and sticks in their hands. In this race the runners participated wearing their finest clothing and elaborate headdresses, one of the most characteristic of which was the circular frontal headdress.