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A theme park in France has a novel and environmentally-friendly way of its grounds free of litter. It has and trained six "intelligent" rooks to up rubbish and keep the park clean. Rooks members of the crow family and are up to 47cm in length. The clever birds will be to work at the Puy du Fou theme park in the west of France. They have been to pick up cigarette ends, paper and other things people on the ground. The birds up the litter and deposit it into a special trash can, which then delivers some bird feed as a reward. The more litter the birds put in the trash can, the more food they .

The head of the theme park, Nicolas de Villiers, the rationale of using the crows to the AFP news agency. He said there several reasons for the crows. He said: "The goal is not just to up, because the visitors are generally careful to things clean, but also to demonstrate that nature itself can teach us to care of the environment." Crows are highly sociable and intelligent birds. Some biologists they are as smart as a seven-year-old child. Mr De Villiers said: "In an affectionate, supportive atmosphere, they like to with humans and a relationship through play." The crows are speedy workers and can a bucket with rubbish in less than 45 minutes.