SKAGIT VALLEY, Wash.—In Washington State, one of the greatest natural wonders is the annual return and departure of migratory birds. However, the birds’ yearly departure in spring not only brings bird watchers (also known as birders) but also creates issues for local farmers and the natural environment. Skagit Valley lies in northwestern Washington, a little over an hour north of Seattle. Each spring, huge flocks comprised of tens of thousands of migratory birds depart against the backdrop of snowy mountains and hundreds of acres of blooming farmland. Geese, swans, and other waterfowl travel 3,000 miles from this scenic valley to Wrangel Island, the most northeastern island in Russia. Many visitors from near and far come to see the birds in their natural habitat. Locals have found ways to profit from that. Andrew Miller is the founder and CEO of Spinach Bus Ventures. With an MBA and background in law, Miller …