Researchers from the University of East Anglia (UEA) in the UK analysed data from 824 harvest areas in private and community-owned forests scattered throughout the 123 million hectare Brazilian state of Para, which is the source of almost half of all timber production in the Brazilian Amazon. The results demonstrate that it is crucial to manage yields of selectively-logged forests for the long-term health of forest biodiversity as well as the financial viability of local industries. The analysis shows that even so-called ‘reduced-impact logging’ in tropical forests can rarely be defined as sustainable in terms of forest composition and dynamics in the aftermath logging.