Vroege vogels TV made an entire episode on the nature and research at the Vlieland barrier islands, which is also the island where Henk-Jan studies the impact of disturbance on shorebirds. Vlieland is particularly interesting from a disturbance perspective, as there is a NATO shooting range on the island, where miltary aircraft and helicopters regularly perfrom maneuvering, shooting and bombing excercises. The item wit Henk-Jan starts at 36:50 minutes, the shooting range and excercises are shown at 23:20 minutes.