In 1981, a gentle release method was used to the Florida Sandhill Cranes from the parent rearing and found that the 15 from 27 individuals (56%) could survival until to the first winter. There was released the 21 of Grater Sandhill Cranes at Grays Lake in 1984 by adjusted in the pen on the release site about 4-6 days before released that resulted to the 9 of released cranes survival.