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- Kachuga dhongoka — Three-striped Roof Turtle
- Kachuga kachuga — Bengal Roof Turtle, Red-crowned Roofed Turtle
- Kachuga sylhetensis — Assam Roofed Turtle
- Kachuga trivittata — Burmese Roofed Turtle
- Kakapo parrot
- Kalocora aurea — Black-banded Bannerwing
- Kalophrynus palmatissimus
- Kapcypriodopsis barnardi
- Kawanphila pachomai
- Kerivoula africana — Tanzanian Woolly Bat
- Ketupa blakistoni — Blakiston's Fish-owl
- Killswitch Engage
- Kimboraga exanimus
- Kiunga ballochi — Glass Blue-eye
- Knipowitschia ephesi
- Knipowitschia mermere
- Knipowitschia milleri
- Knipowitschia thessala — Thessalogovinós
- Kondoconcha othnius
- Konia dikume — Dikume
- Konia eisentrauti — Konye
- Kupeornis gilberti — White-throated Mountain-babbler
- Kupero Zenguana
Read more about this topic: IUCN Red List Endangered Animal Species