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Database entry includes justification for why this species is of least concern

H. Douglas Pratt, Philip L. Bruner & Delwyn. Berrett (1987), A Field Guide to the Birds of Hawaii and the Tropical Pacific, Princeton University Press

Craig Robson (2002), A Field Guide to the Birds of South-East Asia, New Holland Publishers (UK) Ltd.

Adrian Skerrett, Ian Bullock & Tony Disley (2001), Birds of Seychelles, Christopher Helm