Sooty Shearwater Migration — Marlborough Sounds New Zealand
The Hauraki Gulf and Cook Strait see the world's largest seabird migration — up to 15 million sooty shearwaters (tītī) pass through New Zealand waters in November and December on their return from the North Pacific, forming vast flocks visible from the Kaikōura and Marlborough coastlines as dark ribbons of birds stretching across the horizon. The birds' manoeuvrability — using dynamic soaring to cover 1,000 kilometres per day by extracting energy from the wind gradient above wave surfaces — is visually extraordinary from coastal viewpoints, and the flock densities during peak passage create binocular fields entirely filled with moving birds. On Codfish Island and the Chatham Islands, the tītī burrow colonies — some of the world's densest seabird colonies with 150 burrows per square metre on the best slopes — give context to the open-sea flocks as a tangible breeding population rather than an abstract aerial spectacle.
About this spectacle
Each November and December, the waters off Kaikōura and through Cook Strait fill with one of nature's most staggering aerial processions. Up to 15 million sooty shearwaters — known in Māori as tītī — return from the North Pacific in vast, low-skimming ribbons that can stretch to the horizon. Watching from a coastal headland at dusk, you see dark skeins of birds weaving and banking in unison, using dynamic soaring to harvest wind energy above wave surfaces with an effortless, tilting grace. Binoculars reveal individual birds within flocks so dense the entire field of view becomes a mosaic of black-brown wings and glinting white undersides. The sound is a constant rush of wingbeats and wind. For context, visiting the burrow colonies on the Chatham Islands or Codfish Island — some of the densest seabird colonies on earth — transforms the open-sea flocks from abstract spectacle into something anchored in biology: millions of individual birds returning to specific burrows after a round-the-world journey of extraordinary endurance.
When to go
Oct — Mar, peak Nov — Dec
Getting there
Nearest airport: BHE. Nearest city: Blenheim.
Booking options
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