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Message: <blockquote data-quote="s. james" data-source="post: 1447296" data-attributes="member: 21133">Been thinking about this and I'd say with non-native species it's all a question of context and the damage they do.For example an area of urban waste ground might actually benefit from a load of japanese knotweed. As I mentioned before when clearing the stuff in the past I've found a load of bird's nests and plenty of invertebrates. (Just a point- not advocating the planting of knotweed!)However on something like a species-rich meadow the spread of invasive (not necessarily just non-native) species should be controlled.In the case of parakeets, don't think they cause much bother (although haven't read through the whole thread) and unless scientific studies show that they're dramatically affecting other species I think they should be left alone.(...and ruddy ducks are great!)</blockquote>