The farmers say that bringing the bears back into the region on the border between France and Spain under a government project is threatening their livestock.
"There is a growing revolt among farmers and we wanted to show ... that it's a daily occurrence for farmers to have their animals devoured 50 metres from their houses," said Marie-Lyse Brouilh, a local farming official.

The farmers blame one bear named Franska for many of the deaths and on Monday and Tuesday evenings they tried to force her out onto the plain with firecrackers and gunshots.
But local officials say that Franska, who wears a tracking collar, is not responsible for most of the dead animals.
The farmers are expected to meet with local officials soon to discuss the programme that began in 1996 as part of a European bear reintroduction plan.
The farmers complain the project was started by town dwellers and Parisians and does not take their livelihoods into account.
Environmentalists dismiss the idea of any serious damage to sheep or cattle herds caused by a total wild bear population in the region estimated at around 20.
The government says bears kill around 300 sheep and cattle a year in the region. This compares with up to 20,000 losses a year for other reasons.