Oberholser H. C., 1903: List of birds collected by William T. Foster in Paraguay. 21 pp.
 
AVE 158
Oberholser H. C., 1903: Some new South American birds. 10 pp.
 
80855
Oberholser H. C., 1904: A review of the wrens of the genus Troglodytes. 15 pp.
 
80856
Oberholser H. C., 1904: A revision of the American great horned owls. 16 pp.
 
AVE 159
Oberholser H. C., 1904: Descriptions of a new african weaver-bird. 1 pp.
 
AVE 160
Oberholser H. C., 1906: Notes on birds from German and British East Africa. 11 pp.
 
80857
Oberholser H. C., 1909: A revision of the kingfisher genus Ramphalcyon (Pelargopsis). 23 pp.
 
80858
Oberholser H. C., 1911: A monograph of the flycatcher genera Hypothymis and Cyanonympha. 31 pp.
 
80859
Oberholser H. C., 1911: A revision of the forms of the hairy woodpecker Dryobates villosus (Linnaeus). 28 pp.
 
80860
Oberholser H. C., 1913: A revision of the forms of the great blue heron (Ardea herodias Linnaeus). 29 pp.
 
80861
Oberholser H. C., 1915: A review of the subspecies of the ruddy kingfisher, Entomothera coromanda (Linnaeus). 19 pp.
 
80862
Oberholser H. C., 1916: A synopsis of the races of the crested tern, Thalasseus bergii (Lichtenstein). 13 pp.
 
AVE 161
Oberholser H. C., 1916: Critical notes on the subspecies of the spotted owl, strix occidentalis (Xantus). 7 pp.
 
80863
Oberholser H. C., 1917: The birds of Bawean Island, Java Sea. 16 pp.
 
AVE 162
Oberholser H. C., 1919: A review of the subspecies of the leach petrel, Oceanodroma leucorhoa (Vieillot). 8 pp.
 
80864
Oberholser H. C., 1919: Birds collected by Dr. W. L. Abbott on various Islands in the Java Sea. 24 pp.
 
80867
Oberholser H. C., 1920: Notes on the wrens of the genus Nannus Billberg. 14 pp.
 
80868
Oberholser H. C., 1920: The birds of the Tambelan Islands, South China Sea. 15 pp.
 
AVE 164
Oberholser H. C., 1920: The races of the Nicobar megapode, Megapodius nicobariensis Blyth. 4 pp.
 
AVE 165
Oberholser H. C., 1925: Notes on birds collected by Dr. W. L. Abbott on the Karimata Islands, off West Borneo. 4 pp.
 
MAM 154
Obuch J., 1994: Príspevok k pomernému zastúpeniu mikromammálií v Turci. 6 pp.
 
80536
Ogilby J. D., 1911: Descriptions of new or insufficiently described fishes from Queensland waters. 24 pp.
 
ZME 78249
Oijen M. J. P. van, 2004: Haplochromis ushindi spec. nov., the largest piscivorous cichlid in the Mwanza Gulf area of Lake Victoria (East Africa) before the Nile perch upsurge. 6 pp. Zoologische Mededelingen Leiden 78: 249-255.
 
ZME 81251
Oijen M. J. P. van, Roselaar C. S., 2007: Notes on types and early specimens of Bombycivora japonica von Siebold, 1824, and of Bombycilla phoenicoptera Temminck, 1828. 8 pp. Zoologische Mededelingen Leiden 81: 251-258.
 
ZME 82167
Oijen M. J. P. van, Zeeuw M. P. de, 2008: Haplochromis vonlinnei spec. nov., a piscivorous haplochromine cichlid (Teleostei, Perciformes) from the Mwanza Gulf area of Lake Victoria. 9 pp. Zoologische Mededelingen 82: 167-175.
 
ZME 66561
Oijen, 1992: Haplochromis howesi spec. nov., a crab and fish eating cichlid from Lake Victoria. 19 pp. [81177] Zoologische Mededelingen 66(40): 561-579.
 
REP 175
Olexa A., 1962: Über die Haltung des Bunten Zwergchamäleons Microsaurus pumilus Daud. 9 pp. (in German). [M52] Aquarien und Terrarien: 33-41.
 
PSC 218
Oliveira E. C., Ferreira E. J. G., 2002: Occurence of eggs and larvae of migratory Characiformes fish in the Negro River, Amazonas State, Brazil. 6 pp. Acta Amazonica 32(1): 163-168.
 
AVE 166
Olson S. L., Violani C., 1995: Some unusual hybrids of Ramphocelus, with remarks on evolution in the genus (Aves: Thraupinae). 16 pp.
 
MAM 155
Oorschot R. A. H., Cooper D. W., Moore D. S., 1989: The origin of the feral dama (tammar) wallabies Macropus eugenii, in the Rotorua area of New Zealand. 4 pp.
 
REP 84
Opatrný E., 1970: Biometrické srovnání našich druhů skokanů (Ranidae, Amphibia). 19 pp.
 
AVE 167
Orgeira T. J. L., 1995: Seabird observations of the Argentine Atlantic shore between Tierra del Fuego and Buenos Aires. 11 pp.
 
PSC 71
Orsi M. L., Shibatta O. A., 1999: Crescimento de Schizodon Intermedius Garavello Britski (Ostheichthyes, Anostomidae) do Rio Tibagi (Sertanópolis, Paraná). 10 pp. Revta bras. Zool. 16(3): 701-710.
 
SCZ 011
Osborn D. J., Krombein K. V., 1969: Habitats, flora, mammals, and wasps of Gebel’Uweinat, Libyan desert. 18 pp. Smithsonian Contributions to Zoology
 
SPX 32153
Ottoni F. P., Cheffe M. M., 2009: A new species of Australoheros from the upper rio das Antas, laguna dos Patos System, southern Brazil (Labroidei, Cichlidae, Chichlasomatinae). 7 pp. Spixiana 32(1): 153-159.
 
95524
Pagenstecher H. A., 1867: Spanische Stiergefechte. 20 pp. (in German). Der Zoologische Garten 8(9): 321-340.
 
MAM 41
Paglia A. P., Marco P., Costa F. M., Pereira R. F., Lessa G., 1995: Heterogeneidade estrutural e diversidade de pequenos mamíferos em um fragmento de mata secundária de Minas Gerais, Brasil. 13 pp. Revta bras. Zool. 12(1): 67-79.
 
PSC 72
Paiva M. P., Andrade M. F., 1996: Sexual colour patterns in the sandperch Pseudopercis numida Ribeiro (Osteichthyes, Pinguipedidae). 6 pp. Revta bras. Zool. 13(4): 1043-1048.
 
81075
Paiva M. P., Nepomuceno F. H., 1989: On the reproduction in captivity of the oscar, Astronotus ocellatus (Cuvier), according to the mating methods (Pisces – Cichlidae). 17 pp. Amazoniana 10(4): 361-377.
 
80870
Palmer W., 1890: Notes on the birds observed during the cruise of the United States fish commission schooner Grampus in the summer of 1887. 17 pp.
 
MAM 156
Palomares F., Delibes M., 1990: Factores de transformación para el cálculo de la biomasa consumida por gineta (Genetta genetta) y meloncillo (Herpestes ichneumon) (Carnivora, Mammalia). 4 pp.
 
80541
Pankratova V. J., 1959: Donnaja fauna prudov Rybcovo-šemajnogo pitomika i jeje izmenenie pod vlijanijem udobrenij. 49 pp.
 
80542
Pap I., et al., 1996: The Subalyuk Neanderthal remains (Hungary): a re-examination. 38 pp.
 
80543
Papadopol A., 1960: La biologie d’hiver de certains oiseaux. Observations faites dans la région de Bucarest. 30 pp.
 
AVE 249
Papadopol A., 1965: Contributions a la connaissance de la biologie de la couvaison et de la mitrition des poussins chez Parus major L. (Aves). 16 pp.
 
AVE 168
Papadopol A., 1965: Contributions a la connaissance de la systématique répartition et biologie d’Alcedo atthis (L.) en Roumanie. 14 pp.
 
80871
Papadopol A., 1965: Essai sur l’ornithofaune du lac Calarasi et du sud-ouest du marais Borcea (marais Ialomita). 36 pp.
 
AVE 169
Papadopol A., 1965: Le moineau espagnol Passer hispaniolensis hispaniolensis (Temm.) en Roumanie (Aves, Passeridae). 5 pp.
 
AVE 170
Papadopol A., 1968: Considerations on the dynamics of some birds in connection with the Danube and Black Sea shore in Romania. 11 pp.
 
AVE 171
Papadopol A., 1968: Les charadriiformes de Roumanie (II). Contributions concernant l’écologie des espéces couveuses. 17 pp.