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Biology of Birds. New Delhi, India: Discovery Publishing House. ISBN 978-81-7141-933-3. Archived from the original on 10 May 2016. Hildebrand, M. & Gonslow...42 KB (4,707 words) - 02:14, 4 July 2024
Birds. New Delhi, India: Discovery Publishing House. pp. 317–19. ISBN 978-81-7141-933-3. O'Brien, Rory M. (1990). "Family Fregatidae frigatebirds" (PDF)....66 KB (6,616 words) - 07:30, 11 June 2024
Birds, New Delhi, India: Discovery Publishing House, p. 129, ISBN 978-81-7141-933-3, archived from the original on 3 June 2013 Haag-Wackernagel & Moch...67 KB (7,867 words) - 20:03, 31 July 2024
(2005). Biology of Birds. Discovery Publishing House. p. 109. ISBN 978-81-7141-933-3. Scott, Lynnette (2008). Wildlife Rehabilitation. National Wildlife...235 KB (23,446 words) - 08:31, 2 August 2024
(2005). Biology of Birds. Discovery Publishing House. p. 109. ISBN 978-81-7141-933-3. Walther, Bruno A. (2005). "Elaborate ornaments are costly to maintain:...288 KB (31,031 words) - 02:43, 25 July 2024
