Ardeidae, Leach, 1820

Somenzari, Marina, Amaral, Priscilla Prudente do, Cueto, Víctor R., Guaraldo, André de Camargo, Jahn, Alex E., Lima, Diego Mendes, Lima, Pedro Cerqueira, Lugarini, Camile, Machado, Caio Graco, Martinez, Jaime, Nascimento, João Luiz Xavier do, Pacheco, José Fernando, Paludo, Danielle, Prestes, Nêmora Pauletti, Serafini, Patrícia Pereira, Silveira, Luís Fábio, Sousa, Antônio Emanuel Barreto Alves de, Sousa, Nathália Alves de, Souza, Manuella Andrade de, Telino-Júnior, Wallace Rodrigues & Whitney, Bret Myers, 2018, An overview of migratory birds in Brazil, Papéis Avulsos de Zoologia 58, pp. 1-66 : 25

Ardeidae

Nyctanassa violacea (MPR) : occurs from the coast of the USA to northern Peru and Brazil in all coastal states from AP to RS ( Sick,1997;WikiAves,2016).Movements from the subspecies N. v. cayennesis , which occurs in Brazil, are little known ( Martínez-Vilalta & Motis, 1992). In the estuary from Lagoa dos Patos/RS, where it breeds, its occurrence is seasonal between August and April ( Gianuca,2007) and a large part of the population is absent from this state between April and August,when its main prey (the crab Neohelice granulata ) remains in its burrows ( Martínez-Vilalta & Motis, 1992).There are other records for RS in September, October, November, December and February ( Belton, 1984; WikiAves, 2016), which confirm the migratory pattern in the state even though it is present in all other states throughout the year (WikiAves, 2016).