Crows(乌鸦) are remarkably intelligent birds. Now these feathered geniuses are given a job: Six crows have been trained to pick up rubbish in the Puy du Fou historical theme park in western France. Whenever the six crows put cigarette ends or other small 1 (piece) of trash in a special container, it offers a treat to reward the crows 2 their efforts. The idea came from one of the park’s employees, Christophe. In 2012, the theme park held a show during which the crows picked up roses and brought them to a “princess”. It was the show 3 inspired him. Since then, six crows 4 (raise) and trained to do the same with rubbish. The training system is similar to the one for testing crows’ intelligence, 5 a food dispenser(分发器) gives away a food reward when a crow 6 (correct) performs a task. Christophe also introduced other species of birds to go through the training. 7 (compare) with other birds, crows are much cleverer. The purpose of 8 (train) the crows is to educate the people to reflect on themselves. Since the birds are able to protect the environment, we need to care about it too. “It is 9 funny way to remind people not 10 (throw) the rubbish everywhere,” said Christophe.