Kletecka Z., Prisada I. A., 1993: Beetles in the food of the tawny owl, Strix aluco (L.) in the Kharkov Region (Ukraine) (Insecta, Coleoptera). 6 pp. Spixiana 16:227-232.

 Kneucker A., 1909: Zoologische Ergebnisse zweier in den Jahren 1902 und 1904 durch die Sinaihalbinsel unternommener botanischer Studienreisen nebst zoologischen Beobachtungen aus Ägypten, Palästina und Syrien. 90 pp. (in German). Band der Verhandlungen des Naturwissenschaftlichen Vereins 21: 1-90.

 Knöppel H.-A., 1970: Food of central Amazonia fishes. Contribution to the nutrient-ecology of Amazonian rain-forest-streams. [Alimento dos peixes da Amazônia central. Contribuçao a ecología alimentar dos igarapés na floresta pluvial amazônica.] 96 pp. Amazoniana 2(3): 257-352.

 Knöppel H.-A., 1972: Zur Nahrung tropischer Süßwasserfische aus Südamerika. Einige ausgewählte Arten der Anostomidae, Curimatidae, Hemiodidae und Characidae (Pisces, Characoidei). 16 pp. Amazoniana 3(2): 231-246.

 Knöppel H.-A., Junk W., Géry J., 1968: Bryconops (Creatochanes) inpai, a new characoid fish from the Central Amazon Region, with a review of the genus Bryconops. [Bryconops (Creatochanes) inpai, um novo peixe characoídeo da Amazônia Central, com uma revisao do genero Bryconops.] 16 pp. Amazoniana 1(3): 231-246.

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 Knorre von D., 2012: Die Wiederentdeckung der Sumpfspitzmaus (Neomys anomalus Cabrera, 1907) in Renthendorf/Ostthüringen mit Anmerkungen zur Synonymie der Art. 7 pp. Vernate 31: 131-137.

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 Kochan W., 1979: Materialy do skladu pokarmu ptaków drapieznych i sów. 34 pp. [80816] Acta zoologica cracoviensia

 Kock D., Nader I. A., Banaja A. A., 1990: Bandicota bengalensis (Gray & Hardwicke, 1833) new to Saudi Arabia (Mammalia: Rodentia: Muridae). 6 pp. Fauna of Saudi Arabia 11: 323-328.

 Koepcke J., Kraft R., 1984: Cranial and external characters of the larger fruit bats of the genus Artibeus from Amazonian Peru (Chiroptera, Phyllostomidae). 10 pp. Spixiana 7: 75-84.

 Koerber S., 2012: Mercediella nom. nov., a replacement name for Camposichthys Figueiredo a Silva Santos, 1991 (Pisces: Pycnodontiformes). 2 pp. (in English). Bonn zoological Bulletin 61(1): 29-30.

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 Köhler J., Glaw F., Vences M., 1997: First record of Mabuya comorensis (Reptilia: Scincidae) for the Madagascan fauna, with notes on the reptile fauna of the offshore island Nosy Tanikely. 8 pp. (in English). Bolletino del Museo regionale di Scienze Naturali – Torino 15(1): 75-82.

 Köhler J., Güsten R., 2007: Herpetological type specimens in the natural history collections of the museums in Darmstadt and Wiesbaden, Germany. 14 pp. Spixiana 30(2): 275-288.

 Köhler J., Lötters S., 1999: Annotated list of amphibian records from the Departamento Pando, Bolivia, with description of some advertisement calls. 15 pp. Bonner zoologische Beiträge 48(3-4): 259-273.

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 Kolbe H., 1931: Über thermophile Relikte aus der Tertiärzeit und der Postglazialzeit. 24 pp. (in German). Zoologischer Anzeiger 95(5/8): 113-136.

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 Kolibáč J., 1997: Offensive and defensive position in Chichlasoma nigrofasciatum and Cichlasoma meeki (Pisces: Cichlidae). 3 pp. [PSC 126] Acta Musei Moraviae, Sci. biol. 81: 425-427.

 Kollmann M. M., 1918: Note sur les Mammiferes Rapportes D’Asie Mineure par M. Gadeau de Kerville. 4 pp. (in French). .

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 Kondělka D., 1975: Prvý případ přezimování potápky černokrké (Podiceps nigricollis) v ČSSR. 1 pp. 

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 Korth W. W., 1996: A new genus of beaver (Mammalia: Castoridae: Rodentia) from the Arikareean (Oligocene) of Montana and its bearing on castorid phylogeny. 13 pp. Annals of Carnegie Museum 65(2): 167-179.

 Korth W. W., 2000: Review of Miocene (Hemingfordian to Clarendonian) mylagaulid rodents (Mammalia) from Nebraska. 54 pp. Annals of Carnegie Museum 69(4): 227-280.

 Korth W. W., 2007: A new genus of beaver (Rodentia, Castoridae) from the Miocene (Clarendonian) of North America and systematics of the Castoroidinae based on comparative cranial anatomy. 18 pp. Annals of Carnegie Museum 76(2): 117-134.

 Korth W. W., 2011: New species of cricetid rodents (Mammalia) from the late miocene (Hemphillian) previously referred to Peromyscus pliocenicus Wilson. 11 pp. (in English). Annals of Carnegie Museum 79(2): 137-147.

 Korth W. W., 2011: Review of the species of Eumys Leidy, 1856 (Rodentiam Cricetidae) from the oligocene (Orellan to Arikareean) of North America. 12 pp. (in English). Annals of Carnegie Museum 79(2): 79-90.

 Korth W. W., 2013: Mylagaulid rodents (Mammalia: Rodentia: Mylagaulidae) from the middle Miocene (Barstovian) of New Mexico. 13 pp. (in English). Annals of Carnegie Museum 81(4): 233-245.

 Korth W. W., Bailey B. E., 2006: Earliest castoroidine beaver (Rodentia, Castoridae) from the late Arikareean (early Miocene) of Nebraska. 9 pp.  Annals of Carnegie Museum 75(4): 237-245.

 Korth W. W., Baskin J. A., 2009: A new species of Leptarctus (Carnivora, Mustelidae) from the late Clarendonian (Late miocene) of Kansas. 16 pp. Annals of Carnegie Museum 78(1): 29-44.

 Korth W. W., Branciforte C., 2007: Geomyoid rodents (Mammalia) from the ridgeview local fauna, early-early Arikareean (late Oligocene) of western Nebraska. 25 pp. Annals of Carnegie Museum 76(3): 177-201.

 Korth W. W., Diamond M. E., 2002: Review of Leptomeryx (Artiodactyla, Leptomeryicidae) from the Orellan (Oligocene) of Nebraska. 23 pp. Annals of Carnegie Museum 71(2): 107-129.

 Korth W. W., Emry R. J., 2007: A new genus of paramyine (Ischyromyidae, Rodentia) from the Eocene (Uintan to Chadronian) of Wyoming and Utah. 5 pp. Bull. Carn. Mus. Nat. Hist. 39: 151-155.

 Korth W. W., Evander R. L., 2016: Lipotyphla, Chiroptera, Lagomorpha, and Rodentia (Mammalia) from Observation Quarry, earliest Barstovian (Miocene), Dawes County, Nebraska. 36 pp. Annals of Carnegie Museum 83(3): 219-254.

 Korth W. W., Martin J. E., 2007: Additional cranial material of the Miocene beaver Anchitheriomys (Rodentia, Castoridae) from Nebraska. 7 pp. Bull. Carn. Mus. Nat. Hist. 39: 165-171.

 Korth W. W., Samuels J. X., 2015: New rodent material from the John Day Formation (Arikareean, middle Oligocene to early Miocene) of Oregon. 66 pp. Annals of Carnegie Museum 83(1): 19-84.

 Korth W. W., Tabrum A. R., 2011: A new aplodontoid rodent (Mammalia) from the early Oligocene (Orellan) of Montana and a suggested origin for the family Mylagaulidae. 15 pp. Annals of Carnegie Museum 80(1): 67-81.

 Koshiyama Y., Watanabe H., Hirata T., 2012: Record of Anthracophora rusticola (Coleoptera: Scarabaeidae) adults in a breeding nest of the Mountain hawk-eagle Spizaetus nipalensis (Falconiformes: Accipitridae). 3 pp. Japanese Journal of Entomology (N. S.)15(3): 172-174.

 Koshovskij A. A., 1991: Sravnitelnaya morfologiya krovenosnoj sistemy nekotorykh ryb podotryada Scombroidei. 6 pp. Vestnik Zool. 1991(2): 57-62.

 Kostin I. A., 1953: Jadovitye svojstva ryb marinok. 22 pp. 

 Kottelat M., 1989: On the validity of Phractocephalus Agassiz, 1829, vs. Pirarara Agassiz, 1829 (Osteichthyes: Pimelodidae). 1 pp. Spixiana 12(3): 321.

 Kottelat M., Chu X.-L., 1987: Two new species of Rasbora Bleeker, 1860 from southern Yunnan and northern Thailand (Osteichthyes, Cyprinidae). 6 pp. Spixiana 10(3): 313-318.

 Kottelat M., Géry J., 1989: Nemacheilus troglocataractus, a new blind cavefish from Thailand. 5 pp. Spixiana 11(3): 273-277.