It’s well past midnight on Little Barrier Island, called Hauturu in Māori—”resting place of the wind.”
Six of us have been lying on our backs in the wet grass since nightfall, squinting through the spatter of raindrops on our faces. A giant inverted triangle of light looms above the forest clearing, blurred by mist and striated with rain, shooting upward from a floodlight on the ground. Swirling in and out of the beam are the pale underbellies of hundreds of seabirds, their raspy laughter filling the air. They look like constellations of stars that have come loose and started careening around the sky.
Each time one of these rogue stars dips low enough, it comes into focus as a Cook’s petrel, the most abundant bird breeding on this island. But we’re looking for a star that becomes another kind of seabird: a storm petrel.
The New Zealand storm petrel, thought to be extinct for the entire 20th century, was recently found nesting here—a forest-covered old volcano in the Hauraki Gulf, lying a scant fifty miles north of the city of Auckland. It has no other known breeding sites in the world. Its call is loud in our ears, coming from a speaker placed on the ground to draw the birds toward us. Actually, this is the only audio recording of this species in existence: a plaintive note alternating with a sort of squawk, looping every fifteen seconds. We’ve been hearing it on repeat for hours, and I’m fighting a losing battle not to memorize it.
Rain is slowly soaking into my supposedly rainproof jacket and pants, and moisture from the waterlogged ground is seeping in from below. My socks and boots are sopping wet, a delightful reminder of the knee-deep puddle we had to walk through on the way here. Suddenly someone yells out. “Stormy!”
Capturing a New Zealand storm petrel on Little Barrier Island (Illustration: Abby McBride)
It’s scientist Matt Rayner of the Auckland Museum, and he’s not talking about the weather. We all jump up. Three high-lumen torches switch on and converge on an erratically moving shape, pale like the petrels but smaller and scrappier. It appears headless, its dark face disappearing against the sky while its belly reflects white.
Rayner and the other two torch bearers take off at a run, stumbling in gumboots through the hummocky grass, striving valiantly to keep their eyes and their lights on the target as it ricochets around the sky. Like some sort of backcountry ghostbusting team they’re maneuvering to form a triangle around the bird, which seems caught in the nexus of the three beams. Slowly, inexorably, the storm petrel is drawn in a swooping descent to the ground. Rayner gently picks it up.
It was 2003 when a bird that looked a lot like an extinct New Zealand storm petrel was spotted in the Hauraki Gulf, 108 years after its extinction date. Within the next few years, as sightings began to accumulate, scientists managed to capture some of the diminutive black-and-white storm petrels at sea. They confirmed the birds‘ identity genetically using the only three museum specimens in existence, collected in the nineteenth century. Finding this species still clinging to life was nothing short of miraculous. But to safeguard its recovery, researchers needed to know where the burrow-nesting bird was breeding. At that point nobody could be sure if the New Zealand storm petrel’s breeding site was in New Zealand at all.
Steffi Ismar measures the bill of a storm petrel
Rayner is now wading through the soggy grass, storm petrel safely in tow. He crawls under a tarp strung between two trees for shelter from the rain. Settling in next to a box full of banding and measuring tools, he checks the bird for a brood patch. Sure enough, its belly has a patch with no feathers, which means the bird is in active breeding mode. “This measurement was critical for us back in 2013,” he says.
That was when he and fellow researchers, searching for the storm petrel’s breeding grounds, first managed to catch some birds whose bare bellies meant they had nests nearby. In an epic tale of ingenuity and perseverance (recounted here by researcher Chris Gaskin), Rayner and colleagues traced the breeding storm petrels to Little Barrier Island.
Little Barrier is special: arguably New Zealand’s most intact ecosystem, it’s full to the brim with endangered plants and animals, some of which are found nowhere else. On this evening’s walk to the catching site we passed a giant weta sitting at eye level on a tree trunk, looking actually rather cute for a cricketlike insect the size of your hand. Geckos peek from the shrubbery on the edge of the clearing, and we’re hearing strident kiwi calls from the bush on both sides of us (not to mention the incessant “more-pork, more-pork” croaking of New Zealand’s only surviving native owl, which is called—wait for it—a morepork).
The key to this mini paradise? Predator control. Cats were eradicated from Little Barrier by 1980 and rats in 2004. Now the island is mammal-free, like it used to be in the not-so-old days before humans arrived with human-transported pests. In a part of the world where the wildlife evolved without land mammals for 80 million years, invasive predators are serious business—and controlling them can save multiple species of concern at the same time. This storm petrel we’re holding right now demonstrates another benefit of pest control: it can even save species you haven’t discovered yet. Rayner says it’s likely that the New Zealand storm petrel would have gone extinct for real, if Little Barrier hadn’t been cleared of mammals when it was.
Little Barrier Island, Hauraki Gulf, New Zealand
Now the cats and rats are gone, and the storm petrels are found—nearly 500 individuals captured and banded since their rediscovery, and a grand total of four nests located on Little Barrier’s steep slopes. But the work of saving this species isn’t over, which is why we’re here getting soaked. Banding and measuring and collecting blood samples are all part of understanding breeding biology, and that’s a crucial prerequisite to effective conservation.
One of the next big challenges for Rayner’s team is convincing some of the birds to take up residence in a colony of nest boxes—built nearby in the forest—because their natural burrows have proven too cryptic, inaccessible, and fragile to monitor. Another is to find out if there any other islands in the Gulf harboring the elusive storm petrels. The project chugs onward, in true New Zealand style, “on the smell of an oily rag,” with the small but mighty Northern New Zealand Seabird Trust carrying on a continual hunt for funding. Did I mention the floodlight we’re using is made out of aluminum foil, duct tape, tin scraps, and the remnants of an old catapult originally built for one of the island caretaker’s children?
We had a rough boat ride from the mainland to the island earlier in the day. We’ll be out in the rain until the wee hours of the morning and we’ll be back every night for ten days straight, catching and releasing bird after bird. Our gear will get wetter and the puddles will get deeper. But for this bunch, that’s all worth it—because seabird conservation in New Zealand gets results. One of them is this little storm petrel with a new band on its leg.
Originally posted 2018-03-12 05:22:44.