The Belem curassow is a highly endangered subspecies of curassow endemic to Brazil. It is known as the Mytunxî in the Tupi language, the IUCN Red List and BirdLife International have described it as a separate species since 2014, though some authorities including the IOC still consider it a subpecies. This bird is critically endangered as its highly limited range is located within the most deforested part of Amazonia. As with its relative, the Alagoas curassow, it was considered extinct in the wild for many years due to most of its vital habitat being destroyed. However, the species was still listed as Critically Endangered on IUCN as suitable though very scant habitat remained. After over 40 years of no confirmed wild records, a research team with the assistance of Piraha guides managed to rediscover several in the Gurupi Biological Reserve in December 2017. A recording of the birds' alarm calls was also taken and posted online.