Top New Zealand economist Gareth Morgan is launching a campaign to eradicate domestic cats.
Dr Morgan has set up a website called Cats to Go, where he calls the animals sadists and natural-born killers that destroy native wildlife.
SPCA chief executive Bob Kerridge called the scheme "hare-brained" and offensive.
He understood Dr Morgan wanted people to stop buying new cats and to not replace pets when they die.
Are cats too much of a threat to native wildlife? Here is the latest selection of Your Views: