The Kawerau iwi were the first people to settle Tiritiri Matangi, drawn by the same sheltered bays and fertile soil that later attracted European farmers. The Hobbs family worked the land from 1863 to 1971, more than a century of sheep and cattle that stripped the island of nearly all its native bush. By the time farming ended, Tiritiri Matangi was little more than grassland ringed by rocky shores. The island's story could have ended there, a footnote in the long catalog of New Zealand landscapes reshaped beyond recognition by agriculture. Instead, it became a proving ground for an idea that was still radical in the 1980s: that ordinary people, armed with spades and seedlings, could reverse a century of ecological damage.

In 1984, the Department of Conservation launched a reforestation project unlike anything New Zealand had attempted on an island. Volunteers arrived by ferry from Auckland and Gulf Harbour, carrying native seedlings propagated on the island itself. Over the following decades, they planted more than 250,000 trees. The numbers alone are staggering, but what matters more is what followed. As the canopy grew and the undergrowth thickened, conservationists began translocating endangered species to this newly forested refuge. Eleven native bird species made the crossing: red-crowned parakeets flashing green and crimson through the branches, the elusive little spotted kiwi probing the forest floor at night, and the takahе, a flightless bird once believed extinct, stalking through the undergrowth on heavy blue-green legs. Duvaucel's gecko arrived in 2006, and in 2011 the wetapunga, one of the world's heaviest insects, joined the island's growing inventory of returned residents.

Eighty-seven bird species have now been recorded on or near Tiritiri Matangi. Walk the island's tracks and you hear what mainland New Zealand has largely lost: the haunting organ-note call of the kokako drifting from the canopy, the staccato chatter of saddlebacks in the undergrowth, the liquid song of stitchbirds darting between flowering trees. Each of these species carries its own Maori name, a reminder that this soundscape is not new but recovered. The kokako is Callaeas wilsoni. The saddleback is tieke. The stitchbird is hihi. Before predators silenced them on the mainland, these were the everyday voices of Aotearoa's forests. Tiritiri Matangi gives visitors something rare: the chance to hear the country as it once sounded.

Success breeds imitation. The transformation of Tiritiri Matangi inspired similar restoration projects across the Hauraki Gulf, on Motuihe, Motuora, and Motutapu. In 2011, Shakespear Regional Park on the nearby tip of the Whangaparaoa Peninsula became a mammalian pest-free fenced sanctuary, effectively extending the island's reach to the mainland. Birds from Tiritiri Matangi have begun crossing the water to colonize this new habitat, a natural expansion that no one planned but everyone hoped for. The island proved something conservationists had long argued: remove the predators, restore the habitat, and native species will do the rest. What began as a single reforestation project has become a regional network of sanctuaries, each one reinforcing the others.

A ferry from Auckland takes about 75 minutes. Guided tours lead visitors along bush-fringed tracks where birds, unafraid of humans, land within arm's reach. There are no permanent residents, no shops, no accommodation beyond a basic bunkhouse for volunteers. The island operates on a different rhythm, governed by tides and birdsong and the ferry schedule that keeps visitor numbers manageable. Tens of thousands of conservation volunteers have given their weekends to this place over four decades, planting, weeding, monitoring. Their work is visible in every tree. The wind still tosses the island, as it always has. But what the wind carries now, across the water toward Auckland's skyline, are the voices of species that nearly vanished from the earth.