1080 does a real job on the wallaby. Reduces them to pretty much zero. Trouble is they don't do big enough adjoining areas at the same time so they soon re-populate. And they only seem to do the the outer edges to stop their spread so killing a few thousand with 1080 just makes room for another few thousand to move in.
Same with shooting. If neighbours aren't cooperating those who are shooting are just making room for a new influx.
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