to kill an invasive animal can be easy, considering. kill a fish, squash or spray a bug, shoot a sika deer
in my country, the worst invasives are plants. i live an a terrible agricultural country, vast fields, like 30 hectares is allowed max and the farmers are unhappy with that. this alone is pretty destructive. and among all this terrible fields are two groves near the brook. nice, right? but most trees in there is acer negungo. and most herbaceous plants is jerusalem artichoke and goldenrod. Sure, there are some other trees and shrubs, and nettles, but it is mostly foreign. to do something with that would require a massive effort and lot of roundup.