This list of mythical creatures that begin with this letter and I am constantly gathering information from each continent, and is continually being updated.
Kayeri (Cuiva)
The Kayeri is a giant, plant-like humanoid cryptid from the folklore of the Cuiba people of Colombia and Venezuela. Visual descriptors for the beings are varied, ranging from appearing like a giant with a large, mushroom-like hat to appearing like a ficus, making the physiology of the being primarily cryptobotanic in nature.
It is said all the mushrooms of the forest are aspects of the creature, and not unlike mushrooms, Kayeri are said to appear after significant rain and at the base of trees, often dormant after significant sunshine. The Kayeri diet consists solely on cows, and the Cuiban people often attribute the disappearance or deaths of their cattle to the Kayeri who are strong enough to carry bovine away.