The walking-stick has a whalebone and ivory top decorated with a carving of a human skull.

BBC: The man who gives away ?600m a year

Hikers on a secluded trail in Newfoundland, Canada, found a bag containing a human skull in 2001.

FORBES: Magazine Article

Tests on bone fragments at Mr Bridger's house "strongly support" the fact they came from a human skull, she said.

BBC: April Jones case: Jury visits Mark Bridger's home

Dozens of natural and artificial wonders are displayed on the shelves, including a branch of flaming red coral that appears to be growing from the top of a human skull.

ECONOMIST: The art of deception

For the next six years the case lay dormant, until a rancher found a human skull - later identified as Sabrina's - near Douglas Pass, between Dinosaur National Monument and Grand Junction in Colorado.

BBC: British gambler Marcus Bebb-Jones jailed for US killing

With a spectacular spotted coat, muscular body and jaws powerful enough to crush a human skull, the jaguar is a formidable feline, inspiring ancient cultures such as the Maya who depicted the cat in jewellery and ceramics.

BBC: Brazil��s land of the jaguar

They include human teeth, the skull of a woolly rhinoceros, mammoth tusks and a tooth, flint tools and the antler of a giant deer.

BBC: Jersey Post mammoth stamps mark archaeological history

However, Dr Reich points out, if humans and chimpanzees had undergone an initial separation at this time, it could account for why the skull has human-like features, including a relatively flat face without a protruding snout.

ECONOMIST: Humans could have interbred with chimpanzees

The box contained 262 human bone fragments, ranging from complete arm bones to tiny skull fragments.

BBC: Incomplete human skeleton

J. picks out human faces, locates key features and calculates the dimensions of a person's skull.

FORBES: Spotting Evil