A shipment of Brazil-nuts for export in the port of Rio Branco, the capital of the state of Acre. The nuts are extracted only from December to March, when the burs fall from trees that can reach a height of 20 meters. According to several studies, establishing extracting and gathering reserves to grow nuts and various other riches of the forest, like the fruits 'açai' (Euterpe oleracea, cabbage-palm), 'pupunha' (Guilielma speciosa) and 'cupuaçu' (Theobroma grandiflorum), could be much more lucrative than raising cattle in the Amazon.