Genus Chauna is a taxonomic group that comprises two living species: the Northern screamer (Chauna chavaria) and the Southern screamer (Chauna torquata). These birds are also known by several other names, such as the crested screamer, the chaja, and the canoe bird. The genus Chauna belongs to the family Anhimidae, which is a group of South American aquatic birds that are closely related to the ducks and geese. The screamers are characterized by their loud vocalizations, large size, and distinctive crests on their heads. They are primarily herbivores and are found in wetlands and marshes throughout South America.