Watahaki (綿吐, watahaki?, lit. cotton spit) is a green-colored mushi. Its form looks like green cotton which floats through the air.
It enters the body of a pregnant woman and becomes parasitic upon the ovum, destroying it. The woman then gives birth to it in the form a green slime which quickly escapes through the floors below or into the ceiling.
Six months later it sends a fungus in the shape of a baby called Hitotake back to the parents. The Hitotake are connected to the main mass of Watahaki and are used to gather nutrients for the main body (i.e., the Watahaki).