A theme park in France has started a and environmentally-friendly of dealing with litter. It has trained six "intelligent" rooks to pick up . Rooks are of the crow family. They are up to 47cm in . The birds will work at the Puy du Fou theme park in France. They have been trained to pick up ends, paper and other things thrown on the . The birds pick up the litter and put it into a special trash can. This delivers bird food as a . The more litter the birds put in the trash , the more food they get.
The head of the theme park explained it is using the crows. He said there were reasons. He said: "The goal is not just to clean up...but also to demonstrate that itself can teach us to take care of the ." Crows are very sociable and birds. They may be as smart as a seven-year-old . The theme park head said: "In an , supportive atmosphere, they like to communicate with and establish a relationship through ." The crows are quick workers. They can fill a with rubbish in less than 45 minutes.