Surgeon added a second head to a rat for his experiments

The said surgeon has courted controversy with previous experiments involving moneys.

He was Sergio Canavero who has shocked many in the scientific community with his latest experiment which involved creating a group of two-headed rats.

And also working alongside Xioping Ren, Canavero showed that his two-headed rats lived for days.

By cutting off the heads of mouse and adding them to the body of rats, who also had their heads on, doctors recorded the impacts on the rodents.

Each of these mutant animal lived for around 36 hours.

He has been slowly moving towards a scientific capability of performing a human transplant. One of which included spinal cords being reconnected.

Canavero attempted to prove this with dogs last year by severing the spinal cord and then reattaching it.

But doubting experts at the time claimed achieving a human transplant is a long way off.

‘This work would put them about three or four years from repairing a spinal cord in humans,’ medical ethicist Arthur Caplan at New York University told the New Scientist.

‘It would put them maybe seven or eight from trying anything like a head transplant.’ Doctors would have to keep the head from falling into a coma, which is how decapitation kills people.

Canavero used a bloody supply from a third rodent to provide blood both to the rat and the mouse. Either way there are serious ethical issues to performing a head transplant and mutant double-headed people are probably some time off.