The Czill are a species of sapient mobile floral organisms who run the foremost research centre on the southern hemisphere of the Well World. Czills have two brains, located one in each foot. They possess a large, leaf-like organ on the top of their heads, used for photosynthesis, and small pores on their skin to absorb carbon dioxide from the air. The mouth is used only for speech, and the nose is used only for smelling. Their two yellow eyes, located one above the other, have no eyelids and are permanently open. The Czill has no skeleton, its arms and legs being able to bend at any point. The arms end in six long thin fingers.