These days, the Puy du Fou theme park in Western France welcomed six very special cleaners—Boubou, Bamboo, Bill, Black, Bricole and Baco. They are six crows (乌鸦)! As part of the daily show, the theme park has already trained the crows to pick up roses and bring them to a “princess” in a castle （城堡）.
Workers at the park have taught the crows to pick up small pieces of rubbish. The crows move the rubbish （垃圾） into a small box. After helping to clean the park, they get bird food for their hard work.
“The park is very clean,” Nicolas de Villiers, the head of the park, said, “The purpose of the crows is to teach people, to open up their minds to think.”
As a regular （定期的） visitor to the park, Simons, ever said after watching it, "OK! The birds are able to do something that we are much more able to do than them. It shows that we humans cannot throw rubbish everywhere.”
Earlier this year, Josh Klein taught the crows to collect money and drop it in a special machine. After six months of training, he found that the crows could remember how to get food by working.
