The remains of a prehistoric mastodon - a mammoth-like animal - have been found in northern Greece, including intact long tusks.

A Dutch scientist at the site, Dick Mol, says the find near Grevena should help explain why mastodons died out in Europe two to three million years ago.

The mastodon's tusks measure 5m (16.5ft) and 4m, Mr Mol told the BBC.

They are the longest tusks ever found on a prehistoric elephant-like animal. "It is spectacular," Mr Mol said.

There have also been rare mastodon finds in northern Europe, notably in England, Germany and the Netherlands.

Extinction mystery

Mastodons are thought to have first appeared about five million years ago and became extinct in North America about 10,000 years ago - much later than in Europe.

The animals were similar to woolly mammoths, but had tusks that pointed forwards, rather than spiralling upwards. Their teeth were also different.

The team of palaeontologists, including Professor Evangelia Tsoukala of Greece's Aristotle University in Thessaloniki (Salonica), began the excavation on 16 July and is planning to finish it on Wednesday.

Scientists will study the remains at a research centre in the Milia region of northern Greece, and there are hopes that some of the creature's DNA is still intact, Mr Mol told the BBC News website. Various parts of the skeleton have been dug up, along with teeth.

The animal's height was about 3.5m at the shoulder and it weighed some six tons. The mastodon feasted on leaves, unlike the woolly mammoth, which grazed.