A tooth that belonged to an ancient giant shark has been stolen from a World Heritage Site in Australia, authorities have said.
The 8cm (3in) tooth went missing from an undisclosed location in a remote national park in Western Australia.
The fossil came from the Megalodon species, a giant predator that is believed to have died out about 2.6 million years ago, says a BBC report.
Authorities suspect the tooth was deliberately targeted by thieves.
It was one of two Megalodon teeth located in the Unesco World Heritage-listed Ningaloo Coast, according to Western Australia's Department of Environment and Conservation.
"The worst part is they took the better specimen, which was not so well known," said spokesman Arvid Hogstrom.
"Our staff had actually physically covered it up with natural features to make sure it was hidden."
Hogstrom said the stolen tooth had been in a semi-secret location and attached to a rock. Unlike the other tooth, it was not visited by tourists.
Hogstrom said only a small group of locals and others knew of its location. He suspected that a person may have "unwittingly told someone who decided to do the wrong thing".
The fossil was most likely removed with a hammer or a chisel, he said - a breach of vandalism and conservation laws.
He said the monetary value of tooth was not known but it "would not be very high".
The fossil had been well preserved from ancient times.
"Normally, you would just get portions of the tooth, embedded in limestone, rather than an almost whole tooth," Hogstrom said.
The Megalodon, a whale-eating species, could grow up to 18m in length and weigh up to 100 tonnes - about 30 times heavier than the largest great white shark.
Fossils have been found across the world, including in Europe, Africa and the Americas.
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