Nws tuaj yeem ntsia tau rau ntawm kev txhawb nqa cov qauv xws li hoppers thiab tso tsheb hlau luam, thiab tseem tuaj yeem siv rau kev ntsuas qhov ntsuas nrog qis dua. Nws tseem tuaj yeem ntsia tau rau ntawm kev txhawb nqa lossis quab yuam cov qauv ntawm cov khoom siv xws li cranes, xuas nrig ntaus tshuab, thiab dov mills kom muaj kev cuam tshuam cov xwm txheej quab yuam los ntawm kev ntsuas lawv cov strain.