Paul Banko has an enviable commute: he rides his bike through cooled lava flows and dense fern forests to reach his office at Hawai‘i Volcanoes National Park. He’s been climbing trees, poking around in nests and rescuing imperilled birds here since his teenage years.

Back in the 1960s, his father was the first US Fish and Wildlife Serviceemployee assigned to study Hawaii’s endemic avifauna; young Banko tagged along and later built a career out of bird-watching. Now, he’s a research biologist for the US Geological Survey, and an authority on Hawaiian forest birds. His expertise is crucial as biologists prepare to re-introduce the Hawaiian crow – one of the world’s rarest birds – back into the wild.

Hawaiian birds of all types suffered catastrophic decline in the 1800s. Habitat loss, mosquito-borne diseases and predation by introduced rats, cats and mongooses drove scores of native passerines over the cliff of extinction. The ‘alalā, or Hawaiian crow, was poised to follow suit. In 2002, the last pair of wild‘alalā disappeared from the forest, and now, the species exists only in captivity. But thanks to an intensive breeding program managed by the San Diego Zoo, the ‘alalā is getting a second chance.

Banko is one of the few people alive today who has witnessed Hawaiian crows in their natural habitat. “Hearing the ‘alalā really shakes you,” he said. “At dawn, when it’s still dark, the territorial males start screaming at one another. It raises the hair on your back. During summer, the clouds move in and you’re encased in this quiet, cool mist. When the crows go off, it’s this tremendous contrast. If they’re distant and calling, it adds to the mystique.”

Their Hawaiian name, ‘alalā, means to bawl, yelp, caw or cry. Ancient Hawaiians practiced a style of chanting inspired by the bird: vibrating intonations loud enough to project over the din of battle. But ‘alalā aren’t only screamers. The birds’ diverse vocalizations range from soft mutterings and whistles to metallic growls that recall the twang of an electric bass guitar or a revving engine. Banko recorded hours of this mesmerizing avian chatter back in the 1990s, including behavioural notes with each call.

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