Speckled chachalaca

Several taxa formerly included as subspecies of the speckled chachalaca have been considered valid species: the scaled chachalaca (O. squamata Lesson, 1829) in south-eastern Brazil, and the East Brazilian chachalaca (O. araucuan Spix, 1825) in eastern Brazil. The last of these has also been referred to as the Brazilian chachalaca or the white-bellied chachalaca, although the former arguably is problematic as numerous other chachalacas are found in Brazil, while the latter leads to easy confusion with the Central American Ortalis leucogastra. Alternatively, "araucuan" and "squamata" have been included as subspecies of the little chachalaca[2] (the connection between the Guiana Shield and Atlantic forest is known from several other birds, e.g. the buff-throated woodcreeper and the yellow-green grosbeak). Both O. araucuan and O. squamata were originally described as valid species, but – without reason – changed to subspecies of O. guttata. Nevertheless, they all have white scaling/spotting on the lower neck and chest, thus resembling the Amazonian nominate group (incl. "subaffinis"), and most recent authorities continue to treat all as subspecies of O. guttata.

The Colombian chachalaca (O. columbiana Hellmayr, 1906) was formerly considered a subspecies in this group, but is now recognized as a separate species by the South American Classification Committee of the AOU and the IOC.

It is common in large parts of its Amazonian range. Nevertheless, its tolerance of disturbed habitats combined with its relatively small size makes it far less vulnerable than, for instance, the related curassows.