Natural predators are cheaper. In fact, border collies and peregrine falcons have been particularly good at keeping birds at bay on airfields. But they are useless without skilled handlers.
英
美
- 天然食肉动物更廉价。实际上,博德牧羊犬和游隼在使鸟不靠近飞机场上效果特别好。但是没有熟练地训练员,它们是没有用的。