Titi, or sooty shearwaters, have one of the longest migrations of any bird on the planet.
Department of Conservation sea bird scientist, Graeme Taylor, is on Rangatira Island, in the Chatham Islands, to find out where they go.
His team employ a novel approach to try to retrieve 16 geolocators in 10 days.
Have a watch…
Rangatira Island, is one of New Zealand’s premier sea bird islands. It is free of all introduced pests and it is riddled with sea bird burrows.