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- KaleForm of cabbage with green or purple leaves
- KalotermitidaeKalotermitidae is a family of termites, commonly known as drywood termites. Kalotermitidae
- KampecarisKampecaris is an extinct genus comprising the Kampecarida, an enigmatic group of millipede
- KangarooMarsupial of the family Macropodidae
- Kangaroo Island emuThe Kangaroo Island emu or dwarf emu (Dromaius novaehollandiae baudinianus) is an extinct
- Kåre BremerKåre Bremer (born 17 January 1948) is a Swedish botanist and academic. He has also been Vi
- KaryorelicteaKaryorelictea is a class of ciliates in the subphylum Postciliodesmatophora. Most species
- Kashalot-class submarineThe Kashalot-class submarine (NATO reporting name: Uniform), Soviet designation Project 19
- KelpLarge brown seaweeds in the order Laminariales
- KeroplatusKeroplatus is a genus of predatory fungus gnats in the family Keroplatidae. Several specie
- KimchiKorean side dish of fermented vegetables
- KingfisherFamily of birds
- KinyongiaKinyongia (derived from the group's name in Kiswahili language) is a genus of chameleons f
- Kiwi (bird)Order of birds
- KiwifruitEdible berries native to Northeast Asia
- KoalaArboreal herbivorous marsupial native to Australia
- KohlrabiBiennial cultivar of wild cabbage
- KoiColored varieties of Amur carp
- Koi pondPonds used for holding koi
- Komodo dragonLargest living species of lizard
- KrillSmall, shrimp-like crustaceans; order of crustaceans
- Krishna ValleyThe Krishna Valley is an Indian breed of draught cattle. It originated in the areas draine
- KumquatSpecies of small fruit-bearing tree
- KuttanacaimanKuttanacaiman is a monotypic genus of extinct caiman represented by the type species Kutta
- Kyoho (grape)Kyoho grapes (巨峰葡萄, Kyohō budō, lit. 'giant mountain grape'") are a fox grape (Concord-lik