A contraceptive for koalas is being rolled out in the Adelaide Hills this week in a bid to curb the booming population and help preserve the environment.
Currently there are around 150,000 koalas in the Mount Lofty Ranges, which equates to about 13 per hectare.
The Environment Department is trying to get that number down to 1 per hectare by administering hormone implants to around 200 koalas over May and June 2019.
The program mirrors a longstanding successful Kangaroo Island initiative.
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