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The Louvre normally relies on the city authorities to keep the rats under control, but managers have decided that the numbers are intolerable and have called in a private pest control agency.
However, their efforts so far have failed to stop dozens of rats scurrying among people relaxing or picnicking on the lawns of the Jardin du Carrousel. "Food waste left on the lawns attracts rats and encourages their proliferation," a spokesman for the museum said. "We're asking people to be more careful."
Xavier Francolon, a photographer who spent two days documenting the rats' comings and goings, said he was astonished that many people remained indifferent to them.
"People were sleeping on the lawn while rats chased each other right beside them," Mr Francolon told the magazine Le Point. "Kids go up to them and chase them as if they were pigeons and picnickers munch on their meals as if they weren't there."
He said Parisians seem to have got used to the creatures. "They eat their pate, drink their rose or quaff their champagne right next to the rats," he said.