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- forest fragmentation on Amazonian understory bird communities" by Richard O. Bierregaard and Thomas E. Lovejoy, used mist nets to analyze the effects of...13 KB (1,843 words) - 22:21, 11 March 2024
- | Whitehawk Birding Blog". 9 July 2020. Retrieved 9 July 2020. Bierregaard, Richard O. (1994): 224. Black-and-white Hawk-eagle. In: del Hoyo, Josep; Elliott...17 KB (1,967 words) - 18:26, 12 December 2023
- 2016-3.RLTS.T22695845A93530287.en. Retrieved 11 November 2021. Bierregaard, Richard O. (1994): 170. Black-chested Buzzard-Eagle. In: del Hoyo, Josep;...26 KB (2,859 words) - 18:22, 22 February 2024
- Portuguese). São Paulo: Dalgas Ecotec. p. 191. ISBN 85-85015-07-1. Bierregaard, Richard O.; Boesman, Peter F.D.; Kirwan, Guy M. (4 March 2020). "Roadside...16 KB (1,546 words) - 21:58, 2 May 2024
- Waterbirds. 11 (2): 252–262. doi:10.2307/1521007. JSTOR 1521007. Bierregaard, R. O. (1994). "Yellow-headed Caracara". In Josep del Hoyo; Andrew Elliott;...234 KB (23,412 words) - 14:35, 20 May 2024
- 21 (4): 235–242. Retrieved 6 August 2023. Stouffer, Philip C.; Bierregaard, Richard O. (1993). "Spatial and Temporal Abundance Patterns of Ruddy Quail-Doves...251 KB (24,489 words) - 21:53, 26 April 2024
- doi:10.1093/auk/101.3.519. JSTOR 4086604. Corvidae, Elaine L.; Bierregaard, Richard O.; Peters, Susan E. (2006). "Comparison of wing morphology in three...224 KB (29,532 words) - 00:09, 21 May 2024
- sympatric raptor species. Phd Thesis, Univ. of Minnesota, Minneapolis. Bierregaard, R. O. (2018). "Barred Owls: a nocturnal generalist thrives in wooded, suburban...175 KB (22,178 words) - 21:32, 9 May 2024
- Avian Biol. 38 (5): 587–602. doi:10.1111/j.0908-8857.2007.03971.x. Bierregaard, R. O., J. S. Marks, and G. M. Kirwan (2020). Double-toothed Kite (Harpagus...9 KB (1,171 words) - 18:16, 27 December 2023