May 10, 2022 Redesigned birdchaser sleds at Holloman test track saves time, money The birdchaser sleds, used to mitigate bird and animal strikes during HHSTT test missions, are one of the two main methods of mitigating animal strikes. Orchard cannons and small birdchaser sleds are fired in the range of 10 to 40 seconds before the mission sleds.