The speckled rail shares genus Coturnicops with the yellow rail (C. noveboracensis) of North America and Swinhoe's rail (C. exquisitus) of eastern Asia. It is monotypic.[2]
Description
The speckled rail is 13 to 14 cm (5.1 to 5.5 in) long and weighs about 30 g (1.1 oz). The sexes are alike. Adults have very dark brown plumage with white spots on their upperparts and white bars on their underparts.[5]
Distribution and habitat
The speckled rail's core range is southern Paraguay, southern Brazil, eastern Argentina, and Uruguay. It is also found in Guyana and Venezuela and as a vagrant in Colombia. Undocumented sight records in Bolivia and the Falkland Islands lead the South American Classification Committee of the American Ornithological Society (SACC) to class it as hypothetical in those countries.[4] It primarily inhabits dense marshes, swamps, grassy savanna, and rice and alfalfa fields but is also found in the edges of humid woodland. In elevation it ranges from sea level to 1,500 m (4,900 ft).[5]
Behavior
Movement
Some authors propose that the speckled rail is migratory, breeding in the south and wintering in the north. However, there are many records of birds in Brazil, Paraguay, and Uruguay during the austral winter, and birds in breeding condition have been noted in Venezuela.[5] The SACC does not have breeding records from Guyana but notes it as breeding in the four countries of its core range and in Venezuela.[4]
Feeding
Almost nothing is known about the speckled rail's foraging technique or diet. The latter is known to include grass seeds and arthropods.[5]
Breeding
The speckled rail's breeding season is mostly unknown; in the south it appears to include December and in Venezuela August. Nothing else is known about its breeding biology.[5]
Vocalization
As of late 2022 xeno-canto had no recordings of speckled rail vocalizations and the Cornell Lab of Ornithology's Macaulay Library had only two. The species has a "kooweee-cack" call, a whistled "keeee" alarm call, and a high "kyu" whose purpose is unknown.[5]
Status
The IUCN has assessed the speckled rail as being of Least Concern, though its population size is not known and is believed to be decreasing. No immediate threats have been identified.[1] Records are very sparse; the species is assumed to be hard to find but "until further evidence is forthcoming, [it is] best considered genuinely rare."[5]
^ abcRemsen, J. V., Jr., J. I. Areta, E. Bonaccorso, S. Claramunt, A. Jaramillo, D. F. Lane, J. F. Pacheco, M. B. Robbins, F. G. Stiles, and K. J. Zimmer. Version 24 July 2022. Species Lists of Birds for South American Countries and Territories. https://www.museum.lsu.edu/~Remsen/SACCCountryLists.htm retrieved July 24, 2022
^ abcdefgTaylor, B. (2020). Speckled Rail (Coturnicops notatus), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.sperai1.01 retrieved November 26, 2022
