rabbit populations are rampant in greater sydney due to high summer rain .
public land managers are now desperate to reduce population numbers due to the millions of dollars worth of damage they cause .
carrots laced with calicivirus are likely to be scattered in public spaces for a second time this year after an initial attempt failed in some areas .
about 70-100 % of rabbits die once infected with calicivirus , which damages the animal 's liver and gut and causes haemorrhaging and bleeding .