The King Kihunter is a boss in Metroid: Other M. Samus encounters this creature while investigating Sector 1 (Biosphere). The King Kihunter inhabits and grows inside of a massive, organic egg or seed. It apparently has authority over other Kihunters, as shown when it summons them to attack. The King Kihunter itself never actually attacks Samus.
After falling down a large tunnel, Samus lands in a cave, and finds herself surrounded by Kihunter larvae. After inspecting them, adult Kihunters fly in to defend their young. The battle consists of Samus attacking waves of Kihunters, while also shooting at flowers on the ceiling that support the oversized King Kihunter egg. Once all flowers are destroyed, the egg falls to the ground, partially shatters, and Samus must attack the King until it's terminated. At this point, the remaining Kihunters flee the area, and the Little Birdie is seen devouring slime from the egg.