To test the possible success of the world's first human head transplant a test was performed. Using a rat, an outlandish surgeon gave a rat a second head.

Business Insider reported how Sergio Canavero performed the procedure of the world's first human head transplant on a rat after giving it two heads through surgery. The Italian neurosurgeon earned popularity around the world in all kinds of media after announcing his plan of performing the human head transplant in December.

Canavero believes that in his more than 30 years of study, he and his fellow surgeon, Xiaoping Ren can make the procedure a success. However, there are certain claims that the world's first human head transplant is unethical and is against the practice of good.

Even though there are more and more people who don't believe in what Dr. Canavero aims, the persistent doctor does not stop to show proofs of its possible success. Several months before the actual surgery of the world's first human head transplant, Dr. Canavero performed his second experiment to show some percentage of success for the main operation.

Last year, Dr. Canavero performed a "proof-of-concept- procedure" on reconnecting a spinal cord of a severed dog. Now, prior to the actual procedure of the world's first human head transplant, Dr. Canavero published another equally study along with Dr. Xiaoping Ren.

The two surgeons attached the head of a mouse to the body of a rat and the procedure became successful creating a series of two-headed rats. Dr. Canavero and Dr. Xiaoping Ren performed the same procedure in other animals.

On the animals, they have studied most of those lived for several days except the two-headed rat that lived for an average of 36 hours. However, keeping the subjects for experimentation alive was not the goal of Dr. Canavero but instead to stand as an evidence for a possible success of the world's first human head transplant procedure that would take place in the United Kingdom in December, East Texas Matters reported.

The new experiment of Dr. Canavero on performing a surgical operation on a two-head rat leave more people in thinking that the world's first human head transplant is possible to succeed. Eight months to wait for the actual operation of a Russian man with muscular atrophy as the subject for the human head transplant.