They are best known for their remarkable ability to carry heavy loads and a tenacious – almost stoic – approach to toil. In some parts of the world, the donkey has become associated, perhaps unfairly, with terms of insult or mockery. But in a French village around 174 miles (280km) east of Paris, archaeologists have made a discovery that is helping to rewrite much of what we know about these under-appreciated beasts of burden.