If you drive into Hawaiʻi Volcanoes National Park or the summit district of Haleakalā between September and April and see a knee-high goose walking calmly across the pavement in front of your rental car, thatʻs a nēnē. It is the state bird of Hawaiʻi, the worldʻs rarest goose, and, until very recently, one that came within roughly thirty birds of vanishing entirely. (U.S. Fish & Wildlife Service — Recovery Plan for the Nēnē or Hawaiian Goose, DLNR — Hawaiʻiʻs Endangered Species: Nēnē)

Fall is the front edge of nēnē breeding season. Pairs re-form, territories are established, and the birds become noticeably more visible around park roads, coastal refuges, and open pastures on the outer islands. If youʻre planning a September, October, or November Hawaiʻi trip, thereʻs a good chance a nēnē will step into your path at some point — especially if youʻre headed to Kīlauea, Haleakalā, or Kīlauea Point on Kauaʻi. Knowing what to do, what not to do, and why the recovery of this bird is a story worth telling turns a five-second encounter into something worth the trip.

The nēnē (Branta sandvicensis) descends from Canada geese that reached the Hawaiian Islands roughly 500,000 years ago and evolved in isolation into a distinct island species. Over that stretch it lost the fully webbed feet of its mainland cousins, kept only partial webbing between longer toes, and developed padded soles — feet that grip rough ʻaʻā lava rather than paddle open water. Unlike most geese, nēnē spend the majority of their lives on land and are the least aquatic goose in the world. (U.S. Fish & Wildlife Service — Hawaiian Goose (Nēnē) species profile, Smithsonianʻs National Zoo — Nēnē (Hawaiian Goose))

Hawaiʻi designated the nēnē its official state bird in 1957, two years before statehood. (Hawaiʻi State Legislature — State symbols) At that point the bird was already in catastrophic decline; captive breeding programs on the Big Island and in the UK had begun scrambling to save it before it winked out. In the fall of a Hawaiʻi trip, the nēnē you see on the shoulder of the Chain of Craters Road is quite literally the descendant of birds pulled back from that ledge.

Nēnē are the only goose species in the world that nest during the northern hemisphere autumn and winter rather than in spring. Pair bonding intensifies from August onward, and most nesting activity happens from October through March, with peak egg-laying between November and January. (U.S. Fish & Wildlife Service — Hawaiian Goose (Nēnē) species profile, Haleakalā National Park — Nēnē (Hawaiian Goose))

For a fall visitor, the practical effect is that nēnē are more concentrated, more territorial, and more visible in September, October, and November than at any other time of year. Pairs stake out ground on lava fields, kīpuka (islands of vegetation surrounded by newer lava), and open pasture. Males call and posture. Later in fall, females begin scraping shallow nests under low shrubs, often in surprisingly exposed locations along park roads and refuge lawns. Once eggs are laid, incubation takes about a month, and downy goslings walk out of the nest within a day of hatching. (Hawaiʻi Volcanoes National Park — Nēnē)

This inverted seasonality is part of what nearly killed them. Hawaiian evolution timed the breeding cycle to the winter rainy season, when native berries and grasses grew fastest and were most nutritious. When introduced predators — mongoose, feral cats, rats, and pigs — arrived with humans, they hit nēnē nests during a season when no other ground-nesting bird was competing for their attention. Fall-nesting geese with flightless goslings on open lava had no defense. (DLNR — Hawaiʻiʻs Endangered Species: Nēnē)

Nēnē today live on five of the main Hawaiian Islands, but visitor-accessible populations are concentrated in three protected areas. If youʻre planning a fall trip and want a realistic chance of seeing one without going out of your way, aim your itinerary at these.

Hawaiʻi Volcanoes National Park, Big Island. The largest wild nēnē population lives inside the park. Theyʻre regularly seen along Crater Rim Drive, on the Kīlauea Visitor Center lawn, along the Chain of Craters Road as it descends toward the coast, and near the entrance to the Mauna Ulu section. The parkʻs own nēnē page confirms it: “Nēnē may be seen at many places in the park, including along the roadsides, on lawns, and in parking lots.” (National Park Service — Hawaiʻi Volcanoes Nēnē) Slow down on the roads through the park. This is where most of the vehicle strikes on nēnē in Hawaiʻi happen.

Haleakalā National Park, Maui. The summit district and the coastal Kīpahulu district both hold nēnē. In the summit area youʻll see them on the road to the summit, at Park Headquarters (about 7,000 ft elevation), at the Halemauʻu trailhead, and grazing across the cinder slopes near the Visitor Center. In Kīpahulu, they show up in pasture bordering the ʻOheʻo Gulch pools. Haleakalāʻs reintroduced population traces back to birds released in the 1960s and 1970s and now numbers in the several hundreds. (Haleakalā National Park — Nēnē (Hawaiian Goose))

Kīlauea Point National Wildlife Refuge, Kauaʻi. The Kauaʻi nēnē story is different from the two national parks. Thereʻs no captive-release history here; birds re-established themselves on Kauaʻi on their own from Big Island and Maui stock and now nest wild on the cliffs and lawns around Kīlauea Point lighthouse. The refuge is small enough that you can often stand on the entrance lawn or the walk to the lighthouse and watch a pair grazing thirty feet away. (U.S. Fish & Wildlife Service — Kīlauea Point National Wildlife Refuge, USFWS Kauaʻi NWR Complex — Nēnē)

Beyond these three, nēnē also show up regularly on Kauaʻiʻs north-shore golf courses and on Molokaʻiʻs Kualapuʻu and Kaunakakai pasturelands. Those arenʻt formal viewing sites, but if youʻre staying on Kauaʻiʻs north shore in October and playing a round at Princeville, youʻre very likely to see one. (DLNR — Hawaiʻiʻs Endangered Species: Nēnē)

Vehicle strikes are the leading direct cause of adult nēnē death in Hawaiʻi. Hawaiʻi Volcanoes National Park and Haleakalā National Park both post explicit warnings and reduced speed limits in nēnē habitat, and both parks have documented multiple road-kill incidents in recent years. (National Park Service — Hawaiʻi Volcanoes Nēnē page, Haleakalā National Park — Nēnē (Hawaiian Goose))

Two reasons this keeps happening. First, nēnē have been habituated to human food and human proximity for decades by well-meaning tourists tossing bread and crackers at them, and they will now walk directly toward stopped cars expecting a snack. Second, they donʻt fly away when they hear an engine — they lower their heads, walk slowly, and cross when they feel like it, exactly the wrong survival strategy for a paved road. Fall makes it worse, because pairs are aggressive about defending territory and goslings are on the ground once broods hatch.

Practical rules for driving in nēnē country in fall:

• Slow down inside the parks. Speed limits in HVNP are 35 mph on most roads and 25 mph in the summit district. Haleakalāʻs summit road is 15 to 25 mph in sections. Those numbers exist for a reason. - Stop and wait if a nēnē is on or near the pavement. Donʻt honk, donʻt inch forward. They will walk across when ready. - Donʻt stop to feed or hand things out the window. This is how the road-approach behavior was created in the first place. - Watch for goslings in fall and winter. Adults will lead broods across paved roads. Downy chicks can be almost invisible against the black lava on the shoulder.

The nēnē is listed as threatened under the U.S. Endangered Species Act, downlisted from endangered in December 2019 by the U.S. Fish & Wildlife Service in recognition of the recovery. (U.S. Fish & Wildlife Service — Downlisting the Nene from Endangered to Threatened) Threatened status still carries federal legal protection. Harassing, feeding, or approaching a nēnē too closely is prohibited on all federal and state land.

What the rule actually says: keep a minimum distance of 50 feet (about 15 meters) between yourself and any nēnē. If a nēnē walks toward you — and they will, especially in areas where past visitors have fed them — you back away. You donʻt hold your ground so it can get a good photo. (U.S. Fish & Wildlife Service — Kīlauea Point NWR visitor guidance, Haleakalā National Park — Nēnē (Hawaiian Goose))

Feeding a nēnē is worse than it sounds. Bread, crackers, and other human food donʻt match the low-fat, high-fiber diet of native berries, grasses, and seeds their systems evolved for. Chronic feeding causes malnutrition and disease in individual birds. Worse, it teaches nēnē to associate humans and cars with food, which is what puts them in front of tires in the first place. Every fall the parks lose birds to this. Refusing to hand out any snack — even a “small taste” — is not a nitpicky rule; itʻs the single biggest thing a visitor can do to help the population keep climbing. (National Park Service — Hawaiʻi Volcanoes Nēnē)

If a nēnē approaches your car in a parking lot, roll the windows up and drive slowly away. Do not open a door. If a pair is nesting near a trail, the park may rope off the area and post signs — take the detour, donʻt argue about how far a photo would be.

By the 1950s, the wild nēnē population had crashed to an estimated 30 individuals, all on the Big Island, and the species was considered functionally on the edge of extinction. (U.S. Fish & Wildlife Service — Recovery Plan for the Nēnē or Hawaiian Goose) Two captive-breeding programs pulled it back. On the Big Island, rancher Herbert Shipman had been keeping a private flock of nēnē at his Big Island property since the 1920s and provided founding birds to the Hawaiʻi state program at Pōhakuloa. In the UK, ornithologist Peter Scott raised captive nēnē at the Wildfowl & Wetlands Trust at Slimbridge from birds Shipman shipped over, and released offspring back into Hawaiʻi beginning in 1962. (Wildfowl & Wetlands Trust — Nene, Smithsonian Magazine — The Hawaiian Nene Was Saved by an Unlikely English Man)

From that captive nucleus, released birds re-populated Haleakalā and expanded on the Big Island. Kāhoʻolawe, Molokaʻi, Oʻahu, and Kauaʻi were later re-colonized either through releases or by nēnē flying in on their own from established populations. Kauaʻiʻs wild population is now the fastest-growing in the state. Total range-wide numbers today are conservatively estimated at more than 3,000 birds, up from that 1950s low of around 30. (U.S. Fish & Wildlife Service — Downlisting the Nēnē from Endangered to Threatened, USFWS Pacific Region — Nēnē recovery)

Thatʻs still a small population by any standard. It is a major recovery story in the Pacific, but the work is not finished. The 2019 downlisting from endangered to threatened made the progress official. The day-to-day work continues: predator control, habitat management, road signage, and the constant behavioral education aimed squarely at the visitors most likely to accidentally undo it. Thatʻs where you come in.

If youʻre heading to Hawaiʻi between September and November and want to see a nēnē:

• Plan at least one day inside Hawaiʻi Volcanoes National Park or the Haleakalā summit district. Thatʻs where the odds are highest. - Drive under the posted speed limit on all park roads. If youʻre not sure whether the road is in nēnē habitat, assume it is. - Keep at least 50 feet between yourself and any nēnē you encounter. If the bird approaches you, back away. - Do not feed a nēnē. Not bread, not crackers, not a piece of banana. Not one time. - Donʻt try to touch nests, chase pairs, or corner a bird for a photo. If a nēnē is displaying (head bobbing, hissing, wings partly spread), youʻre too close — back off. - On Kauaʻi, add Kīlauea Point National Wildlife Refuge to your itinerary. The nēnē on the lighthouse lawn there are one of the easiest sightings in the state.

A nēnē encounter, done right, is quiet. You slow the car, roll down the window, and watch a bird whose entire species came within a few dozen individuals of vanishing walk calmly past your bumper. Then you drive on, having done nothing to it and nothing for it except not screwing it up. Thatʻs the whole deal. Every year, the population keeps climbing because a few million visitors mostly do this correctly. Fall is the season to be one of them.