With K the discussion consists of Kangaroo, Kinkajou, Kiwi bird, and Killer Whale.

Kangaroo
Scientific name Macropodidae
Red Kangaroo  - Macropus rufusEastern Grey Kangaroo  - M. giganteus ,
Western Grey Kangaroo - M. fuliginosus
Antilopine Kangaroo - M. antilopinus
Group name: Troop

Kinkajou
Scientific name - Potos flavus
Group name: Troop

Kiwi Bird
Scientific name - Apteryx
Group name: Tribe

Killer Whale
Scientific name - Orcinus orca
Group name: Pod