Rasmussen P. C., 2005: Biogeographic and conservation implications of revised species limits and distributions of South Asian birds. 10 pp. Zoologische Mededelingen Leiden 79 (3): 137-146.

 Reichholf J., 1976: Faunistische Daten zur Vogelwelt der Stauseen am unteren Inn (2). 8 pp. 

 Reichholf J., 1977: Die Avifauna der zentralasiatischen Republiken der UdSSR: ornithogeographische Aspekte. 3 pp. Spixiana 1(2): 137-139.

 Reichholf J., 1977: Die Avifauna der zentralasiatischen Republiken der UdSSR: ornithogeographische Aspekte. 3 pp. [AVE 269] Spixiana 1(2): 137-139.

 Reichholf J., 1978: Faunistische Daten zur Vogelwelt der Stauseen am unteren Inn (4). 10 pp. 

 Reinert B. L., Pinto J. C., Bornschein M. R., Pichorim M., Marini M. Á., 1996: Body masses and measurements of birds from Southern Atlantic Forest, Brazil. 6 pp. Revta bras. Zool. 13(4): 815-820.

 Reis K. R., Steadman D. W., 1999: Archaeology of trants, Montserrat. Part 5. Prehistoric avifauna. 13 pp. Annals of Carnegie Museum 68(4): 275-287.

 Renet J., 2005: Contribution a la connaissance de l’avifaune du Parc Naturel Départemental de la Grande Corniche (Alpes-Maritimes, France). Premiers résultats d’une année de prospection (Aves). 29 pp. Biocosme Mésogéen 22(3): 125-153.

 Renet J., 2005: L’Alouette calandrelle Calendrella brachydactyla subsp. brachydactyla, une nouvelle espece nicheuse dans le département des Alpes-Maritimes (France). 1er cas de nidification, sur le plateau de Calern. 7 pp. Biocosme Mésogéen 22(2): 97-103.

 Řepa P., 1979: Ptactvo samoty Rozcestí u Rozvadova v Českém lese. 11 pp. 

 Reteuna D., 1994: La migrazione degli accipitriformes, falconiforems e ciconiiforms attraverso le Valli di Lanzo. 27 pp. 

 Ribeiro M. G., Teles M. E. O., Maruch S. M. G., 1995: Morphological aspects of the ovary of Columba livia (Gmelin) (Columbidae, Columbiformes). 7 pp. Revta bras. Zool. 12(1): 151-157.

 Ribeiro M. G., Teles M. E. O., Maruch S. M. G., 1997: Histologia e histoquímica do magno, um dos segmentos do oviduto de Numida meleagris (Linné) (Numididae, Galliformes). 8 pp. Revta bras. Zool. 14(1): 213-220.

 Richmond C. W., 1895: Description of a new species of Ant Thrush from Nicaragua. 2 pp. 

 Richmond C. W., 1895: Partial list of birds collected at Alta Mira, Mexico, by Mr. Frank B. Armstrong. 6 pp. 

 Richmond C. W., 1896: Catalogue of a collection of birds made by Doctor W. L. Abbott in Eastern Turkestan, the Thian-Shan Mountains, and Tagdumbash Pamir, Central Asia, with notes on some of the species. 23 pp. 

 Richmond C. W., 1896: Catalogue of a collection of birds made by Doctor W. L. Abbott in Kashmir, Baltistan and Ladak, with notes on some of the species, and a description of a new species of Cyanecula. 43 pp. 

 Richmond C. W., 1897: Catalogue of a collection of birds made by Doctor W. L. Abbott in Madagascar, with descriptions of three new species. 18 pp. 

 Richmond C. W., 1900: Description of a new bird of the genus Dendrornis. 2 pp. 

 Richmond C. W., 1900: Descriptions of three new birds from Lower. 3 pp. 

 Richmond C. W., 1902: List of generic terms proposed for birds during the years 1890 to 1900, inclusive, to which are added names omitted by Waterhouse in his “Index Generum Avium”. 67 pp. 

 Richmond C. W., 1903: Birds collected by Dr. W. L. Abbott and Mr. C. B. Kloss in the Andaman and Nicobar islands. 28 pp. 

 Richmond C. W., 1903: Birds collected by Dr. W. L. Abbott on the Coast and Islands of Northwest Sumatra. 40 pp. 

 Richmond C. W., 1909: Generic names applied to birds during the years 1901 to 1905, inclusive, with further additions to Waterhouse‘s „Index generum avium.“ 71 pp. 

 Richmond C. W., 1917: Generic names applied to birds during the years 1906 to 1915, inclusive, with additions and corrections to Waterhouse’s “Index Generum Avium”. 72 pp. 

 Richmond C. W., 1917: Generic names applied to birds during the years 1906 to 1915, inclusive, with additions and corrections to Waterhouse’s “Index Generum Avium”. 72 pp.  Discount 20%!

 Ridgway R., 1889: A review of the genus Sclerurus of Swainson. 11 pp. 

 Ridgway R., 1889: A review of the genus Xiphocolaptes of Lesson. 20 pp. Proceedings of the United States National Museum for the year 1889. Volume XII.

 Ridgway R., 1889: Scientific results of explorations by the U. S. Fisch Commission Steamer Albatross. No. I. – Birds collected on the Galapagos Islands in 1888. 39 pp. 

 Ridgway R., 1890: Observations on the Farallon rail (Porzana jamaicensis coturniculus Baird). 3 pp. 

 Ridgway R., 1896: Characters of a new American family of Passerine birds. 2 pp. 

 Ridgway R., 1896: Description of a new species of ground warbler from Eastern Mexico. 2 pp. 

 Ridgway R., 1896: Description of a new subspecies of the genus Peucedramus, Coues. 1 pp. 

 Ridgway R., 1896: On birds collected by Doctor W. L. Abbott in the Seychelles, Amirantes, Gloriosa, Assumption, Aldabra, and adjacent islands, with notes on habits, etc., by the collector. 38 pp. 

 Ridgway R., 1896: Preliminary description of some new birds from the Galapagos Archipelago. 2 pp. 

 Riley J. H., 1905: A new subspecies of ground dove from Mona Island, Porto Rico. 2 pp. 

 Riley J. H., 1919: Annotated catalogue of a collection of birds made by Mr. Copley Amory, Jr., in northeastern Siberia. 20 pp. 

 Riley J. H., 1926: A collection of birds from the provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock. 70 pp. 

 Riley J. H., 1929: A review of the birds of the islands of Siberut and Sipora, mentawi group (Spolia mentawiensia). 46 pp. 

 Riley J. H., 1930: Birds collected in inner Mongolia, Kansu, and chihli the National Geographic Society’s Central- China expedition under the direction of F. R. Wulsin. 39 pp. 

 Riley J. H., 1930: Birds from the small islands off the Northeast Coast of Dutch Borneo. 24 pp. 

 Riley J. H., 1931: A second collection of birds from the provinces of Yunnan and Szechwan, China, made for the National Geographic Society by Dr. Joseph F. Rock. 91 pp. 

 Robinson W., 1895: An annotated list of birds observed on the Island of Margarita, and at Guanta and Laguayra, Venezuela. 38 pp. 

 Robinson W., Richmond C. W., 1902: An annotated list of birds collected in the vicinity of La Guaira, Venezuela. 16 pp. 

 Roda S. A., Farias Á. M. I., 1999: Aves silvestres infestadas por Phthiraptera (Insecta) na Zona da Mata Norte de Pernambuco, Brasil. 8 pp. Revta bras. Zool. 16(3): 871-878.

 Rodríguez H. O., Rodríguez V. H. R., 1983: Charadrisu collaris, Viellot 1818, inverna en la Bahia de concepcion (Aves: Charadriidae). 5 pp. 

 Rodríguez-Llano J. A., 1990: Uso del espacio por diversas especies de aves en los jardines de la Granja: importancia de la estructura de la vegetación y de las especies arbóreas. 6 pp. 

 Rodríguez-Teijeiro J. D., Pigcerver M., Ortiz C., Gallego S., Nadal J., 1997: Incubation behaviour of the common quail (Coturnix c. coturnix) under conditions of food abundance. 9 pp. 

 Rojas M. de, Úbeda J. M., Guevara D. C., Ariza C., 1993: Estudio de cinco especies de ácaros plumícolas del género Proctophyllodes Robin, 1877 (Acarina, Proctophyllodidae) parásitas de aves paseriformes espanolas (2 fig.). [Study of five species of feather mites genus Proctophyllodes Robin, 1877 (Acarina, Proctophyllodidae) parasitic on Spanish paseriform birds.] 6 pp. Bol. R. Soc. Esp. Hist. Nat. (Sec. Biol.) 90(1-4): 55-60.

 Rosian B., Spreitzer J., 2008: Brutnachweis der Zwergrohrdommel Ixobrychus minutus (L.) in 870 m Seehöhe am Furtnerteich in der Obersteiermark, Österreich (Aves). 4 pp. (in German). Joannea Zool. 10: 85-88.