I just had a dig into what altitude they fly at and 2,000 meter ceiling would make things more complicated. Hot air balloons dropping nets, or some weather bal

I just had a dig into what altitude they fly at and 2,000 meter ceiling would make things more complicated. Hot air balloons dropping nets, or some weather balloons - again tethered. Though would probably want to run with hydrogen for costs, just safety and training go up, so greater initial costs there. So many details. Kinda gets down to sky versions of submarine nets in predictable flight paths into crop area's as being the best spots to set such trapping nets up. Though if it turns out you just need to lay down football sized green carpet and that attracts them - well that opens up other avenues in trapping or indeed - zapping them once they touch down.