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Trainers put young unleashed birds who are just learning to fly and hunt on a hack board, a sort of artificial nest.

Screamer shuttled between Bovina and Perry’s hack board for almost a week.

He carried Screamer to the hack board, a food platform on stilts.

He flapped and he flew, too, but only as far as a tree limb— not to the hack board.

Screamer, on the hack board, saw the shadow above him and instinctively crouched.