Rooks have abandoned nests rung in by landowners for control by Waikato Regional Council.
The council is again asking landowners to report rook sightings for targeted pest control to prevent the wary invasive,
big black bird from becoming a problem on farms.
After requesting rook sightings in September this year, right on breeding season, seven rookeries were reported to the
council.
Waikato Regional Council biosecurity officer Andrew McConnell says five of those rookeries had since been abandoned, so
he was keen to hear if any landowners had seen any newcomers on their property in the last few weeks. The two other
rookeries received control.
“The season seems to be a later this year so there is a chance they still may breed.”
Breeding season is a good time to start seeing rooks as it’s when they congregate together.
In the Waikato, rook populations are found in Te Poi/Matamata, Cambridge/Hamilton and Mangakino to Taupō, with rooks
generally building nests in pine or eucalyptus trees.
Rooks are one of the most destructive farm production pest birds in the world.
“They feed on newly sown crops and destroy paddocks by tearing them up in search for grubs. A large rook population can
completely destroy entire paddocks. It’s definitely not something we want to be seeing here in our region.”
Rooks were introduced to New Zealand in the 1860s to control insect pests. The largest colony found in New Zealand was
nearly 1000 nests but, thanks to control, such groupings are a thing of the past.
The regional council has been managing rooks since 2002 and the Waikato population is now estimated at less than 50
birds.
“It’s a bit like looking for a needle in a haystack for them, which is why we need landowners to give us a call when
they see rooks” says Mr McConnell.
“They’re also very wary so it’s important that landowners contact us if they see them rather than try get rid of them
themselves. We don’t want to scare them; it becomes tricky locating rooks once they have been spooked.”
Last year, five rookeries were found and controlled: three in Mangakino and two in Matamata. A rookery in Hamilton was
destroyed by a storm and abandoned.