Optimal weather conditions, with an unseasonably warm winter, have led to an spike in rabbit numbers in Hawke's Bay.
Hawke's Bay Regional Council team leader biosecurity animal pests Allan Beer said survival rate of rabbits was higher in warmer weather.
"The mortality rate of rabbits is pretty high in a cold wet weather but if you get a mild winter, like we have had this year, the mortality rate is much lower so a lot more rabbits survive."
The exact number is hard to quantify, he said.
"We rely on information from members of the public to give us an indication.