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Over Grand County Drones Are Bird Watching, Not People Watching

The U.S. Geological Survey is turning the unblinking eye in the sky of drones to a more benign purpose. Instead of watching the battlefield, they’re bird watching.


In April, scientists spent three days flying a small four-pound Raven A drone above several greater sage grouse breeding grounds north of Kremmling, Colo.

Scientists think that they could make population surveys cheaper by using drones instead of more expensive airplanes or helicopters.


The experiment is part of a larger project within the Department of Interior’s Geological Survey to recycle retired military drones. In recent years, the National Unmanned Aircraft Systems Project Office has coordinated with state and federal agencies to use drones to study everything from mountain pine beetle damage in Colorado to documenting bank erosion along the Missouri River in South Dakota.

USGS Hydrologist Chris Holmquist-Johnson explains that right now scientists are trying to figure out if they can capture thermal and photo images of the greater sage grouse using the drone.

What do the birds think?

“So far what we’ve seen is that they really don’t seem to be bothered by it,” says Homquist-Johnson. “We’re able to get that imagery and they don’t flush or move on to a new location.”


When it comes to counting birds with drones, the Geological Survey has had previous success counting Sandhill Cranes in Monte Vista National Wildlife Refuge. In 2011 scientists compared results from Raven A flights to those of ground observers. They were accurate enough that in 2012 only the drone was used. In future years, the practice could save federal agencies money.

So how far can these drone experiments go?

Credit U.S. Geological Survey
A compilation of thermal and visible wavelength images of sage grouse

Researchers are circumspect about how far drones will advance bird counts.

Chris Holmquist-Johnson says one limitation comes from the lower resolution cameras and sensors in the Raven-A. Overall, experiments with drone technology are in the very early stages. “As systems get better and sensors are better then we’ll be able to do an even better job of the science we’re trying to answer,” he says.

The Geological Survey office overseeing these drones gets more than a dozen calls a week from other Interior Department units interested in using them. Upcoming experiments include surveying pygmy rabbit habitat in Idaho, counting mule deer in Nevada and a climate change study near Niwot, Colo.

It’s a scientific solution for repurposing drones, keeping an eye on our world and wildlife – or even our potatoes.

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