The godwits also fly into the Whanganui estuary, Miranda on the Firth of Thames and Christchurch.
In March the godwits fly back to Alaska to begin breeding in May.
Satellite tracking data has tracked their non-stop flight south across the central Pacific Ocean.
Their speed was also tracked at 60km an hour.
Before migration the godwit packs on fat under the skin, in the abdomen and around its heart, which is its main fuel for its long flight south.
On arrival the godwits rest and feed intensively to replace the reserves lost in flight.
The return to their breeding grounds in Alaska includes a stopover in the Yellow Sea and North Korea so they arrive in good condition to begin breeding.
For more information: Wildlife Foxton Trust, wildlifefoxton.nz