The park falconer Christophe Gaborit, in charge of the falconry at Le Puy du Fou theme park, looks at two of his crows, trained to clean up garbage and cigarettes butts from the parking of Le Puy du Fou, in Les Epesses, western France. /VCG Photo

 Six crows specially trained to pick up cigarette butts and rubbish were put to work last week at a French historical theme park. /VCG Photo

“They were motivated by the reward, and they soon understood how the game worked,” said Christophe Gaborit. Crows are highly sociable, intelligent and as smart as the average seven-year-old child. /VCG Photo