1.   Scientists say they believe a farmer picked up this new skull and found a buyer who paid cash.

2.   Sivapithecus also has no frontal sinuses and the new skull of Ankarapithecus does.

3.   The eye sockets of the new skull are more square, similar to skulls of gorillas, chimps and humans.

4.   The new skull was found far to the west.

5.   Before the operation the skin on their head was stretched to help cover their new skulls.

6.   Leakey said the species represented by the new skull could have been an ancestor of modern humans, or it could have been an evolutionary dead end.