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It's a scorching August day in the Elwha Valley, and it only feels bleaker as we peer into the 200-foot void of Glines Canyon Dam. A sputtering trail of water marks the concrete lip where, for nearly a century, two hulking braces trapped logs, rocks, and sediments as they washed down from the mountains of northern Washington, forming a reservoir that was six times deeper than a competition-diving pool. At its height, the dam churned out 13.3 megawatts of hydroelectricity, enough to power 14,000 homes and a local paper mill. But it also the Elwha River’s ecology, along with that of surrounding Olympic National Park. Endangered chinook salmon were cut off from their spawning sites; fish-eating birds and otters suffered; and estuaries became more brackish and shallow. Finally, in 1992, the U.S. government to destroy Glines Canyon Dam and the nearby Elwha Dam. Yet it wasn’t until two decades later when the water .

The dam demolition—the largest in the nation’s history—had a cathartic effect on the park. As the lake behind Glines Canyon drained out, the Elwha slipped back into its ancient route, leaving and other swaths of land exposed. But the heart of Olympic was still scarred and veined. Prior to the construction of the dams, hundred of acres of old-growth forest had been sawed down. It would take take centuries for the valley to fully repair itself. Someone—or something—had to assist.

Thankfully, the and the National Park Service (NPS) were already on the case. The two groups have been exploring ways to heal the Elwha watershed since the 1980s, when the razing of the dams was first proposed. “Removal [was] the most dramatic restoration tool we [had],” says tribal biologist Kim Sager-Fradkin. In the end, they decided on that splits the leviathan task of reviving the valley between multiple agencies. The Klallam would repair the basin around the Elwha Dam. About five miles south, NPS would focus on Lake Mills, the dried-up, stump-riddled gulf beneath Glines Canyon.

In 2012, with bulldozers still ripping out layers of concrete, NPS botanists and volunteers began like bitter cherry, salmonberry, oceanspray, and grand fir into the sandy soils of the Mill basin. The seeds and cones are plucked from healthier forests in the park and reared in just outside its bounds, safe from the elements and grazing mouths of deer and elk. Once they’ve sprouted to a good height, the saplings and shoots are placed back in the landscape to help fend off invasive weeds and build a self-reliant ecosystem. “It’s really about allowing this place to restore itself,” John McLaughlin, an ecologist from Western Washington University, says.

However, not all of the plantings are cultivated by hand. The burgeoning river and winds also shuttle willow, cottonwood, and red alder seeds from the woods to the canyon. And McLaughlin, who’s been studying the park's inhabitants for more than a decade, insists there’s another force at play: birds. They’re numerous, mobile, and have been among the first to return to the battered valley. “They’re the ideal partners,” he says

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ack in the early 2000s McLaughlin joined a group of scientists to gather baseline data on species diversity in the Elwha Valley. They scrambled to note every sample of pre-removal flora and fauna, from the tops of stumps to the crowns of trees. McLaughlin played his part by documenting birds. He drove or, when the river flooded the road, biked up to the dams every May to parse out and identify calls. “You stand still for minutes at a time, listening for each pip and squeak,” he explains. Once the final stage of demolition wrapped up at Glines Canyon in 2014, McLaughlin shifted his focus to the park’s newcomers; within weeks, he was finding signs of species that weren’t present in his earlier surveys.

During these scouting missions, McLaughlin looked for birds traveling through a 150-feet channel between the Mill basin and neighboring forests. He noted the distance and origin of the flight, along with what each individual chose to land on. Over the course of two seasons, he turned up seven species of warblers and sparrows that hadn’t been recorded before. He also found that American Robins accounted for more than 70 percent of the flights. This was a good sign: Most of the birds on McLaughlin’s list—robins included—favored early-stage habitats. The Park Service’s seeding program, it seemed, was working.

But the birds were more than just hints of success. After the surveys, McLaughlin and his students spent the summer probing the reservoir’s dusty surface for fresh bird scat. The goal was to figure out which seeds were being left behind, and whether the guano was in fact, aiding the Elwha Valley’s revival. They discovered that birds were bringing in woody plants from other parts of the park, essentially delivering the ingredients for a starter forest to the restoration site. The team was dropped on top of or under pieces of wood. Logs, McLaughlin says, not only provide a safe perch from hungry weasels, but they also act like micro-nurseries. Growing conditions on the lakebed are harsh, with high sun and wind exposure and strong evaporation rates. The stumps serve as shelter for infant plants while also offering a glut of nutrients.

Still, McLaughlin wasn’t sure if the seeds were even viable . . . which is why he decided to add scooping poop to his list of job requirements.

You Can Help. Don't let birds do all the work. With our native plant database, discover which plants will provide the best habitat for your birds.