Macaws are species that nest in naturally generated cavities in the largest trees of the forest, mainly in Shihuahuacos (Dipterix sp.) in the case of Scarlet and Red and Green macaws. When a branch of at least two meters in diameter breaks off, a slow natural process of decomposition and healing begins in the trunk of the tree, which generates the cavity that will later be used by a couple of macaws to nest. In other words, for the time it takes a Shihuahuaco to acquire two meters in diameter and for the time it takes for the cavity to form, at least 300 years must pass for a Shihuahuaco tree to have a suitable cavity to be used as a nest. Currently, the Shihuahuacos are being felled selectively and rapidly in forests whose purpose is not formal timber production, throughout the Amazon. The logging of Shihuahuacos occurs at a rate much greater than the natural capacity of the species to recover its populations and, therefore, to produce trees suitable for nesting macaws. The scarcity of natural nest sites, coupled with the fact that, according to the Wildlife Conservation Society, less than 20% of the macaw population breeds, poses a high level of threat to macaw survival.