It could ''devastate'' Otago's environment if wallabies established themselves here, the Otago Regional Council says.
About 35 people attended the council's presentation on the issue in Ranfurly yesterday.
Regional council senior environmental officer Kevin Allan said Bennett's wallabies were potentially an ''enormous problem'' for the area.
''If these wallabies are allowed to establish, they're going to devastate our environment potentially, or certainly change the environment in a significant way.''
The number of reported incidents in Otago ''substantially'' increased in early 2016, although this was partly due to increased awareness, he said.
''We can safely say we have wallabies in Otago.''