Five ice-age mammoths in an extraordinary state of preservation have been discovered in the Cotswolds, to the astonishment of archaeologists and palaeontologists.

The extensive remains of two adults, two juveniles and an infant that roamed 200,000 years ago have been unearthed near Swindon, along with tools used by Neanderthals, who are likely to have hunted these 10-tonne beasts. More are expected to be found because only a fraction of the vast site, a gravel quarry, has been excavated.

Judging by the quality of the finds, the site is a goldmine. They range from other ice-age giants, such as elks – twice the size of their descendants today, with antlers 10ft across – to tiny creatures, notably dung beetles, which co-evolved with megafauna, using their droppings for food and shelter, and freshwater snails, just like those found today. Even seeds, pollen and plant fossils, including extinct varieties, have been preserved at this site.

All these will now offer new clues into how our Neanderthal ancestors lived in the harsh conditions of ice-age Britain, a period of prehistory about which little is known. The exceptional discoveries will be explored in a BBC One documentary, Attenborough and the Mammoth Graveyard, to be aired on 30 December, in which Sir David Attenborough and evolutionary biologist Professor Ben Garrod join archaeologists from DigVentures to film the excavation.

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Garrod told the Observer: “This is one of the most important discoveries in British palaeontology.” While the odd mammoth bone often turns up, he said, finding such complete skeletons is “incredibly rare”. “Where these mammoths lie in the ground is exactly where they died a quarter of a million years ago – next to incredible things like stone tools and the snails they trampled underfoot.

“We have evidence of what the landscape was like. We know what plants were growing there. The little things are really revealing the context of these big, iconic giants. It’s a glimpse back in time. That’s incredibly important in terms of us understanding how climate change especially impacts environments, ecosystems and species.”

Lisa Westcott Wilkins of DigVentures, an archaeology social enterprise, said: “Exciting doesn’t cover it. Other mammoths have been found in the UK but not in this state of preservation. They’re in near-pristine condition. You can’t take it in”.

Read more: The Guardian