An avian girdle comprises a frame, which includes a mounting part connecting a first assembly structure to a front section in a distance, and the front section linking between a rear section and a second assembly structure. When the avian girdle has been putting onto a bird for a flight practice, its mechanism distributes a counterweight from the mounting part, with equipment of a data collection device for collecting information on the back of the bird, and decreases the air resistance. Therefore, the bird can carry a heavier load than it does when wearing a foot ring, with unilateral configuration of a tracking device on one foot affecting bird's flying performance.
