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low,it is larger than that in 1995,when only 51 remained on earth.The growing population is a result of the government's de- cision and the efforts of a team led by Andrew Rigby,a scientist. The researchers tagged each bird with a smart transmitter (发射器).Its information is picked up and sent to the scientists, allowing them to locate where the birds are nesting and get to know if they are sick.The trackers also allow the team to control the parrots'diet at the right time.Once the birds lay eggs,the eggs are taken from the nests.Once the eggs hatch,each mother is given only one chick,while the rest are hand-raised,which helps ensure they all receive enough food. While such efforts to bring back a species may seem unrea- sonable,Rigby believes it is vital for the future of all endangered