A non-native snake able to cause significant damage to the local environment has been caught in Tahmoor.
The adult American corn snake is among the top 10 non-native pest animals listed by the NSW Department of Primary Industries (DPI) as it is one of the most unwanted exotic pests.
Wollondilly Council said corn snakes were prolific breeders and has urged residents to keep an eye out for them.
Last week a snake handler was called out to Tahmoor by a resident who had sighted a "white and orange, weird-looking python."
Acting director of infrastructure and environment Alex Stengl said it was essential the reptile, and any others like it, are caught.
"Pest animals can create a big impact on the environment, native animals, agriculture, and livestock," he said.
"We are asking the community to keep your eyes peeled for any non-native pest animals.
"We need your help to ensure corn snakes don't become residents in the Wollondilly."
The council believes the snake may have been imported illegally and released.
Corn snakes are illegal to keep in Australia outside of a zoo as they cause substantial damage by disrupting ecosystems, introducing diseases, preying on native animals and competing with them for limited food resources.
The corn snake is a successful invasive species and non-native populations of corn snake have established in the Cayman Islands, the Virgin Islands and the Bahamas.
If you see an American corn snake or other non-native species, please report it to the NSW DPI by phone on 1800 680 244 or through their website: dpi.nsw.gov.au/biosecurity/report.