Polycephaly is the condition of having more than one head. The term is derived from the Greek stems poly (Greek: "πολύ") meaning "many" and kephalē (Greek: "κεφαλή") meaning "head". A polycephalic organism may be thought of as one being with a supernumerary body part, or as two or more beings with a shared body.

What causes Polycephaly?

Two-headedness results from factors that cause malformation of a developing embryo, which can be both genetic or environmental. But it does not tend to be inherited, since two-headed animals do not usually live long or reproduce.

What is a two head?

Definition of two heads are better than one

—used to say that it is easier for two people who help each other to solve a problem than it is for one person to solve a problem alone We need to work together to figure this out. Two heads are better than one.