‘Long lost cave in New Zealand’ reveals million-year-old wildlife, extinct birds, and a Kākāpō ancestor

For a long time, New Zealand’s ancient past felt incomplete. Bits and pieces here and there. A few fossils. Large gaps. A cave located close to Waitomo on the North Island has recently brought about a subtle shift in this perception. The remnants of animals that lived approximately one million years ago have been discovered by scientists within it, including bones and fragments of species previously unknown to researchers. It feels like stumbling into a forgotten chapter or maybe a whole missing book. The fossils suggest Aotearoa once supported ecosystems very different from what we see today. Dense forests. Climates that moved about. Explosions that were violent. Strange creatures. Long before humans ever arrived, nature was already reshaping life here in dramatic and sometimes surprising ways.The cave itself is part of the surprise. Researchers say it appears to be the oldest known cave yet found on New Zealand’s North Island. That alone raised eyebrows among geologists and fossil experts who study the region closely.What made it so valuable, though, was timing. The fossils were trapped between two layers of volcanic ash. One from an eruption roughly 1.55 million years ago. Another from a massive blast around 1 million years ago. That sandwich of ash gave scientists something rare. Precise dates. Most ash from eruptions gets washed away over time. And inside, the remains of at least 12 bird species and four frog species were waiting, preserved far better than anyone expected. The fossils offer a glimpse of New Zealand as it looked long before people. Experts say it seems the country’s wildlife was already going through cycles of loss and renewal. Species disappearing. According to the research, published in Alcheringa, titled The first Early Pleistocene (ca 1 Ma) fossil terrestrial vertebrate fauna from a cave in New Zealand reveals substantial avifaunal turnover in the last million years, as many as a third to half of species may have gone extinct in the million years before humans arrived. That’s a striking number.Associate Professor Trevor Worthy from Flinders University says this was a completely different avifauna. Not just older versions of modern birds. A distinct community that didn’t make it through the next stretch of time. It suggests extinction wasn’t an exception back then. It was part of the rhythm.So what caused all this turnover? The evidence points to nature itself. Rapid climate shifts. Repeated volcanic eruptions. Some of them are enormous. One eruption, around a million years ago, reportedly covered much of the North Island in metres of ash. Forests would have vanished. Food sources are gone. Habitats were erased almost overnight.Dr Paul Scofield from Canterbury Museum describes it as a kind of reset. Forests are turning to shrubland. Then back again. Birds forced to adapt or vanish. It’s not hard to imagine how brutal that would have been. Strigops insulaborealis, a new species of parrot, is among the most fascinating discoveries. It’s an ancient relative of today’s Kākāpō, the heavy, flightless parrot that has become a symbol of conservation in New Zealand. This ancestor appears different. Lighter construction. Weaker legs. Researchers suggest it might have been able to fly. Or at least fly better than its current descendant.That thought alone is fascinating. The Kākāpō we know now feels nearly ancient already. A pigeon closely related to Australian bronzewing pigeons and an extinct ancestor of the Takahē were also found in the cave. Subtle clues of how intertwined ecosystems previously were.