A burrowing dog made a mammoth find when he unearthed a tooth belonging to one of the Ice Age giants.
The collie, named Mavrik, was being walked in Poland’s Carpathian mountains, when owner Andrzej Sikorski saw him struggling to pull something from the ground.
The 24-year-old said: "I thought he had found an old bone - but I didn't realise straight away just how old.
"I took it home and saw the ridges which looked familiar. So I did some research and I was sure it was a woolly mammoth tooth.”
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Carbon dating tests carried out by Poland’s Institute of Systematics and Evolution of Animals showed the tooth to have come from one of the six-ton giants about 200,000 years ago.
"I should take him fossil hunting more often. Maybe next time he'll dig up as T-Rex," added Skiorski.
This North American bird, which stood over 8 feet tall, would have had an enormous, axe-like beak.
This heavily-armored predator had the second most powerful bite of any fish.
The hornless rhinoceros-like creatures of this genus were the largest land mammals of all time.
Giant ground sloths of this genus were about the size of today's elephants. The megatherium only went extinct around 10,000 years ago (right around the time when humans started farming), and smaller relatives may have survived as late as the 16th century!
Richard Owen, director of London's Museum of Natural History, stands next to the largest of all moa. Moa, which originated in New Zealand, were flightless, and some were even wingless.
The Argentavis magnificens, an early relative of the Andean Condor, was the largest flying bird ever discovered.
These creatures, the largest marsupials that ever lived, roamed Australia. Some scientists have suggested that stories of the supernatural 'bunyip' creature in Aboriginal folklore could be based on diprotodonts.
These distant relatives of modern elephants had an imposing appearance, with strange, downward-curving tusks and heights of up to 16 feet at the shoulder.
Leedsichthys problematicus & Liopleurodon rossicus
The fearsome Liopleuredon, right, had a jaw nearly ten feet long. The Leedsichthys, left, was a bony fish that may have been even larger than it looked; some estimates put its maximum length at 53 feet. <strong>Correction</strong>: <em>An earlier version of this slide had the positions of the Liopleuredon and Leedsichthys reversed</em>.