On a recent winter morning, Thomas watches as a young bald eagle dives at some 3,000 snow geese floating in the rice fields.

“As soon as they start getting here, this is what I sit and do,” he says “I keep my binoculars in my truck.”

The birds come here because Thomas keeps his rice fields flooded in December and January. The water decomposes the rice straw leftover from last year’s harvest.

Normally, at the end of January, “we would let our water go and start trying to dry our fields out because the lake that’s in front of us has to be dry enough to drive a tractor in it and then we’ve got to seed it,” he says

But not this year. Thomas is leaving water on his fields a little longer as part of an experimental project with The Nature Conservancy, designed to provide extra habitat for the birds when they need it most.

Thomas’s farm is in the middle of the Pacific Flyway, a vast migration route that stretches from the Arctic to South America. The Central Valley is a key pit stop for millions of birds along the way.

“California is really the linchpin of the Pacific Flyway,” says Nature Conservancy scientist Mark Reynolds.

“Many of these species breed in the high Arctic and are coming down to spend the wintertime in southern latitudes.”

Some birds, like snow geese, spend the winter in California. Others only stop briefly before continuing hundreds of miles south.

“It’s like stopping on a road trip so anywhere that they can find habitat and find things to eat to put on fat for their journey, they’ll stop,” he says.

But wetlands aren’t as abundant as they once were. Ninety percent of the Central Valley’s historic wetlands have been filled in and dry years like this one make it even tougher.

"California is really the linchpin of the Pacific Flyway"

“Many of these water bird species on the flyway have had long-term declining population trends,” Reynolds says.

Reynolds wanted to know where and when the birds need wetlands, so he turned to an app called e-Bird. Birders have used it to report tens of thousands of bird sightings, creating a detailed data set.

“What it gives us that we’ve not really had before is for many, many species, we now can look week-by-week at arrival patterns in California,” Reynolds says.

In places that lack wetlands, the Nature Conservancy asked rice farmers to put up bids, pricing out how much it would cost to keep their fields flooded.

The group is paying farmers to create about 10,000 acres of these temporary wetlands in February and March. The bidding process is secret, but bids came in both above and below $45 per acre, the payments some farmers get from federal conservation programs.

Thomas says his cost is largely labor. “It’ll push back our planting cycle,” he says. “We can’t get into our fields earlier. So we’re putting harder, longer hours on our tractor and our crew. We’re taking a greater risk doing this.”

Thomas will keep two-to-four inches of water on his fields for four weeks. The water level is tailored for shorebirds, like long-billed dowitchers, sandpipers, and godwits.

Nature Conservancy economist Eric Hallstein says the payments help offset the farmers’ risks and are a cost-effective way to create habitat.

“The traditional model in conservation – it’s actually to permanently buy a piece of property or an easement,” Hallstein says. “It’s very expensive, prohibitively expensive. And also, we don’t want to displace farmers from that property.”

Douglas Thomas sees a more personal upside. “Northern pintail is my favorite bird,” he says. “It’s such a graceful, amazing creature. And that we’re part of that annual cycle, that’s a neat, special thing.”

By April, his fields will be dry and the birds will be on their way back north.