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BODRATI, Alejandro  and  ARETA, Juan Ignacio. Two new nightjars to the avifauna of Argentina (Chordeiles acutipennis and Caprimulgus maculicaudus), and comments on their habitat, behaviour and distribution in Paraguay. Hornero [online]. 2010, vol.25, n.2, pp.67-73. ISSN 0073-3407.

We present records of two caprimulgid species hitherto unreported for Argentina: the Lesser Nighthawk (Chordeiles acutipennis), and the Spot-tailed Nightjar (Caprimulgus maculicaudus). The genus Caprimulgus would thus be represented by five species in Argentina, and the genus Chordeiles by three. Chordeiles acutipennis was observed (without formal evidence) in the provinces of Salta, Chaco and Formosa, and Caprimulgus maculicaudus was observed and tape-recorded in Misiones Province. We discuss fieldmarks of Chordeiles acutipennis. We provide other observations and records of both species in Paraguay, where Chordeiles acutipennis is considered hypothetical, and also describe the display of Caprimulgus maculicaudus in detail.

Keywords : Argentina; Caprimulgus maculicaudus; Chaco; Chordeiles acutipennis; Distribution; Formosa; Identification; Misiones; Paraguay; Salta.

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