Zhao Xinchun, deputy head of the Locust and Rat Control Office in Xinjiang, where the birds are trained and used, explains: “Farmers knew that chickens were very fond of eating locusts, so we did some tests [and] found that ducks can eat more than chickens [up to 400 locusts each per day], are tougher than chickens in bad weather and do not get eaten by eagles or weasels....
Lindude õpetamisega tegeleva Xinjiangi rohutirtsude ja rottide kontrollameti direktori asetäitja Zhao Xinchun selgitab: „Põlluharijad teadsid, et kanadele meeldivad väga rohutirtsud, seepärast tegime mõned katsed [ning] selgus, et pardid söövad rohkem kui kanad [kuni 400 rohutirtsu päevas], nad on halva ilma korral kanadest vastupidavamad ning neid ei puutu kotkad ja nirgid....