- Karoo Long-billed Lark
- Karoo Prinia
- Karoo Scrub-Robin
- Karoo Scrub Robin
- Karoo Thrush
- Karoo Thrush (Turdus smithi)
- Karpas Peninsula and the Klidhes Islands
- Karpas Peninsula and the Klidhes Islands Cyprus
- Karthala Scops-Owl
- Karthala Scops Owl
- Karthala White-eye
- Karwendel Nature Protection Area
- Karwendel Nature Protection Area Austria
- Kashmir
- Kashmir Flycatcher
- Kashmir Nutcracker
- Kashmir Nuthatch
- Kashmir Tit
- Katanga Masked-Weaver
- Katanga Masked Weaver
- Kaua'i
- Kauai
- Kauai Akialoa
- Kauai Amakihi
- Kauai Elepaio
- Kauai Nukupuu
- Kauai Oo
- Kaua‘i
- Kaui Elepaio
- Kaumana Trail(Eastern Saddle, Hawai'i)
- Kaumana Trail (eastern Saddle, Hawai'i)
- Kaupifalco
- Kaupifalco monogrammicus
- Kaupifalco monogrammicus monogrammicus
- Kawall's Amazon
- Kawall's Parrot
- Kazakhstan
- Kazakstan
- Kaziranga
- Kaziranga N. P.
- Kaziranga NP
- Kaziranga N P
- Kaziranga National Park
- Kea
- Keel-billed Motmot
- Keel-billed Toucan
- Kefar Ruppin
- Kefar Ruppin Israel
- Kei White-eye
- Kelbia Lake
- Kelbia Lake Tunisia
- Kelley's Tit-Babbler
- Kelley's Tit Babbler
- Kelp Goose
- Kelp Gull
- Kemp's Bush-creeper
- Kemp's Longbill
- Kemp's Warbler
- Ken-Dee Marshes
- Kenfig Nature Reserve
- Kenfig Nature Reserve(Bridgend)
- Kenopia
- Kenopia striata
- Kenrick's Starling
- Kent
- Kentish Plover
- Kentucky
- Kentucky, Purchase Region
- Kentucky Warbler
- Kenya
- Kenya Grosbeak Canary
- Kenya Rufous-Sparrow
- Kenya Rufous Sparrow
- Kenya Sparrow
- Kenya Violet-backed Sunbird
- Kenya Yellow-rumped Seedeater
- Keoladeo National Park
- Keoladeo National Park, India
- Keoladeo National Park India
- Kerala Laughing-thrush
- Kerala Laughingthrush
- Kerguelen Petrel
- Kerguelen Shag
- Kerguelen Tern
- Kermadec Megapode
- Kermadec Petrel
- Kern River and Indian Wells Valleys
- Kerrera
- Kerrera Scotland
- Kessler's Thrush
- Kestrel
- Kestrels
- Ketupa
- Ketupa blakistoni
- Ketupa blakistoni blakistoni
- Ketupa flavipes
- Ketupa ketupu
- Ketupa ketupu ketupu
- Ketupa zeylonensis
- Ketupa zeylonensis semenowi
- Ketupa zeylonensis zeylonensis
- Kevo Nature Reserve
- Kevo Nature Reserve Finland
- Key West Quail-Dove
- Key West Quail Dove
- Khao Yai National Park
- Khao Yai National Park Thailand
- Khijadia Bird Sanctuary
- Khijadiya Bird Sanctuary
- Khios (Chios)
- Khios (Chios) Greece
- Kibale Ground-Thrush
- Kibale Ground Thrush
- Kikau
- Kikuyu White-eye
- Kilconquhar Loch
- Kilimanjaro White-eye
- Killarney National Park
- Killarney National Park Ireland
- Killdeer
- Killdeer Plover
- Killiecrankie
- Killiecrankie RSPB Reserve Scotland
- Kilohana, Ka'ohe GMA, or Pu'u La'au, Hawai'i(West slope of Mauna Kea,)
- Kilohana, Ka'ohe GMA, or Pu'u La'au, Hawai'i (west slope of Mauna Kea)
- Kilombero Cisticola
- Kilombero Weaver
- Kimberley Flyrobin
- Kimberley Honeyeater
- Kimberley Imperial Pigeon
- Kimberley Pipit
- Kimberly Pipit
- Kinabalu National Park
- Kinabalu Park
- Kincardineshire
- King-of-Saxony Bird-of-Paradise
- King-of-Saxony Bird-of-paradise
- King Bird-of-Paradise
- King Bird-of-paradise
- King Bird of Paradise
- King Cormorant
- King Crow
- King Eider
- King Gull
- King Island Emu
- King Penguin
- King Quail
- King Rail
- King Shag
- King Vulture
- King of Saxony Bird-of-Paradise
- King of Saxony Bird-of-paradise
- King of Saxony Bird of Paradise
- Kingbird
- Kingbirds
- Kingfisher
- Kingfisher Park
- Kinglet Calyptura
- Kingley Vale National Nature Reserve
- Kingsbury Water Park
- Kingsbury Water Park(Kingsbury, North Warwickshire)
- Kinkimano
- Kinkimavo
- Kinnordy RSPB Reserve Kirriemuir Angus Scotland
- Kinnoull Hill
- Kioea
- Kioloides Rail
- Kipengere Canary
- Kipengere Seedeater
- Kirghiz Yellow Wagtail
- Kiribati
- Kiritika Warbler
- Kiritimati Reed Warbler
- Kiritimati Sandpiper
- Kiritimati Shearwater
- Kirk's White-eye
- Kirkby Gravel Pits
- Kirtland's Warbler
- Kisar
- Kisbalaton
- Kisbalaton Hungary
- Kiskunsag National Park
- Kiskunsag National Park Hungary
- Kite
- Kites
- Kithulgala
- Kittacincla cebuensis
- Kittacincla luzoniensis
- Kittacincla malabarica
- Kittacincla nigra
- Kittlitz's Murrelet
- Kittlitz's Plover
- Kittlitz's Sand Plover
- Kitulgala
- Kivu Ground-Thrush
- Kivu Ground Thrush
- Kiwi
- Kiwis
- Klaas' Cuckoo
- Klaas's Cuckoo
- Klages's Antbird
- Klages's Antwren
- Klages’s Antbird
- Klais
- Klais guimeti
- Kleinothraupis
- Kleinothraupis atropileus
- Kleinothraupis calophrys
- Kleinothraupis parodii
- Kleinothraupis reyi
- Kleinschmidt's Parotia
- Klingnauer Stausee
- Klingnauer Stausee(Northern Switzerland)
- Klingnauer Stausee (Switzerland)
- Kloss's Leaf-Warbler
- Kloss's Leaf Warbler
- Knipolegus
- Knipolegus aterrimus
- Knipolegus cabanisi
- Knipolegus cyanirostris
- Knipolegus franciscanus
- Knipolegus hudsoni
- Knipolegus lophotes
- Knipolegus nigerrimus
- Knipolegus orenocensis
- Knipolegus poecilocercus
- Knipolegus poecilurus
- Knipolegus signatus
- Knipolegus striaticeps
- Knipolegus subflammulatus
- Knob-billed Duck
- Knob-billed Fruit-Dove
- Knob-billed Fruit Dove
- Knobbed Hornbill
- Knysna Scrub-Warbler
- Knysna Scrub Warbler
- Knysna Turaco
- Knysna Warbler
- Knysna Woodpecker
- Koch's Pitta
- Koengke Babbler
- Koepcke's Hermit
- Koepcke's Screech-Owl
- Koepcke's Screech Owl
- Koepcke's screech-owl
- Kofiau Monarch
- Kofiau Paradise-Kingfisher
- Kofiau Paradise Kingfisher
- Kokako
- Koklass Pheasant
- Kolea
- Kolombangara Leaf-Warbler
- Kolombangara Leaf Warbler
- Kolombangara Monarch
- Kolombangara White-eye
- Kolombangra Leaf Warbler
- Kolombangra Monarch
- Kolombangra White-eye
- Kolvanan Uuro
- Kolvanan Uuro Finland
- Kona Grosbeak
- Kopacki Rit Reserve
- Kopacki Rit Reserve Croatia
- Kopje Warbler
- Kordofan Lark
- Kordofan Rufous Sparrow
- Kordofan Sparrow
- Korea
- Korean Flycatcher
- Korhaan
- Korhaans
- Kori Bustard
- Korimako
- Kos
- Kos Greece
- Koshi Tappu Wildlife Reserve
- Koshi Tappu Wildlife Reserve(Koshi Tappu, South East Nepal)
- Koslov's Accentor
- Koslov's Babax
- Koslow's Bunting
- Kosrae
- Kosrae Crake
- Kosrae Fruit-Dove
- Kosrae Fruit Dove
- Kosrae Island Starling
- Kosrae Starling
- Kosrae White-eye
- Kotihe
- Kozlov's Accentor
- Kozlowia
- Kozlowia roborowskii
- Krankesjon-Klingavalsan
- Krankesjon-Klingavalsan Sweden
- Krankesjön-Klingavälsån
- Kretschmer's Longbill
- Kretuonas Lake
- Kretuonas lake(Lithuania)
- Kristianstad Area Sweden
- Kristianstad area
- Krknose National Park
- Krknose National Park Czech Republic
- Krkonose National Park
- Krueper's Nuthatch
- Kruger National Park
- Kruper's Nuthatch
- Krüper's Nuthatch
- Kuala Selangor
- Kubary's Crow
- Kuhl's Lorikeet
- Kuhl's Sunbird
- Kulal White-eye
- Kulambangara Honeyeater
- Kulambangara Myzomela
- Kulambangra Honeyeater
- Kulambangra Leaf-Warbler
- Kulambangra Leaf Warbler
- Kulambangra Monarch
- Kulambangra Myzomela
- Kulambangra White-eye
- Kumlien's Gull
- Kungwe Apalis
- Kupeornis
- Kupeornis chapini
- Kupeornis gilberti
- Kupeornis rufocinctus
- Kurdish Wheatear
- Kurdistan Wheatear
- Kurochkinegramma hypogrammicum
- Kuronian Spit and Lagoon
- Kuronian Spit and Lagoon Latvia
- Kurrichane Buttonquail
- Kurrichane Thrush
- Kusaie Mountain Starling
- Kutch Bustard Sanctuary
- Kutch Bustard Sanctuary - Naliya Grassland
- Kutch Desert Wildlife Sanctuary
- Kuusamo
- Kuusamo Finland
- Kuwait
- Kvismaren
- Kvismaren Sweden
- KwaZulu-Natal
- Kyrgyzstan
- København
- Kühn's White-eye


