Acentury ago, scientists used to them determine that the right side of the body was connected to the left side of the brain, and vice versa; that damage to the back of the brain resulted in vision damage; and that damage to the left-front part of the brain produced difficulties with speech.

Scientists used case studies to help them determine that the right side of the body was connected to the left of the brain and vice versa. A case study is a process or record of research into the development of a particular person, group or situation of a given period of time.

It would be generation 5 in which there will be almost 100% non-singing females if there are no changes in the birds’ environment and interactions