Kodi Brady lives in the town of Coonabara Bran, a few hours' drive from Sydney.

Every morning he goes out and shovels hundreds of dead mice from various traps on his farm.

But it does not help.

Each mouse can have hundreds of cubs and now the authorities have started handing out free rat poison and started a massive control work.

- My house is sealed like a submarine. I have put rubber around doors and at windows, says Kodi Brady.