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Just feed and give water to the poor creatures.
After they kill the cats, what are they going to do about the exploding rat population?
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Cats, rats, mice, dingos, rabbits. All introduced and invasive. Bats and the monotremes are the only no -marsupial mammals indigenous to Australia. There are marsupial ecological equivalents to rodents, but they really aren’t rodents, per se.
The Aussies have another invasive species, rabbits are a huge problem there too. Saw a couple videos from the 50’s showing rounding them up in a fence and smashing them about with a cricket bat.