Genus Nyctanassa refers to the group of species comprising the night-herons, which are wading birds commonly found in wetlands and marshes around the world. Some of the synonyms used to describe this genus include Nycticorax griseus, Nycticorax violaceus, and Nyctanassa violacea, all of which denote the same group of birds. These bird species are known for their nocturnal habits, hence the name, and are characterized by their thick bills, long necks, and subdued brown and gray plumage. While all species under the genus Nyctanassa share similar physical attributes and behaviors, they may vary in size, range, and preferred habitats.