Probably not anytime soon. Duck enthusiasts are far fewer in numbers (it's hard to tell how much), John Metzer of Metzer Farms in Gonzales, Calif., the largest hatchery for egg-laying ducks in the U.S., says his sales of ducks for egg (and meat) production are rising fast. "It's definitely an expanding market," Metzer tells The Salt.

Metzer sells about 35,000 ducklings bred to produce eggs a year. "But that's going to grow," he says. "Every year, we put more breeders in and it's not enough. I run out quickly, and then they're back-ordered five weeks." The majority of his clients buy just a few ducks for the backyard.

One of them is Daniel Paduano, a friend who introduced me to the duck egg at his beautiful certified organic farm in the Santa Cruz mountains in March. Paduano chose ducks over chickens to raise at his small farm in 2009, after attending a workshop on raising ducks versus chickens. Now he's one of the duck egg's most passionate advocates.

Paduano's flock of about 10 ducks is well-suited to his farm where he grows mostly citrus, avocado and other fruit. Each morning, he lets the snow-white ducks out of their coop, gives them a small bowl of pellets and then ushers them out into his fields to devour the slugs, snails and insects in the soil near his avocado trees. They also may stop by his pond to snack on string algae he pulls out for them.

Paduano says the ducks' ability to forage up to 90 percent of their food is one their greatest attributes. And they help him control pests around his trees. He's also a big fan of duck manure: "It is not too hot to put right on trees, unlike chicken manure which will burn trees if not composted beforehand."

Back east, Doug Toth has a small farm in Rougemont, N.C. He raises about 150 birds of various breeds: quail, guinea, chicken, duck, turkey and goose. Toth says a backyard duck's diet of bugs and other wild critters is partly what explains the amazing flavor of the eggs.

"Store-bought, grain-fed eggs always have a pale flavor and poor yolk," he says. "When my girls are out eating bugs and grasses all day, we end up with deep orange yolks. There is simply more flavor, on every level."

Paduano chose to raise ducks over chickens because he was impressed with their eggs' nutritional profile. For him, this is especially important since it's one of the only sources of animal protein his vegetarian family of four gets. Duck eggs have more fat and a bit more protein that chicken eggs, but they really shine when it comes to vitamins A, B6, B12, calcium and potassium.

So why aren't duck eggs in every grocery store? According to Todd Applegate, a poultry scientist at Purdue University, one of the reasons why chickens became the favored egg producer is that, by weight, they're simply more efficient at converting feed into eggs.

"The chickens we've bred as egg layers can now produces over 300 eggs a year while ducks will only lay 220 eggs max," he says. Ducks, though, produce eggs longer. They go for two to three years instead of the typical chicken hen's one to two years.

Applegate says chickens need about 1.6 pounds of feed to make one pound of eggs, while ducks need to eat about 2.5 pounds to produce a pound of eggs.

Toth notes that ducks are indeed big eaters. "They eat a lot more than chickens. This is painful in the winter months when they have limited forage and blow through the bags of feed. Now that they're finding good spring forage, my feed costs are about half what they were," says Toth.

While some duck producers call their ducks the most charismatic of their households, that's not true for everyone, nor every breed. Toth admits his ducks, most of which are Indian runners, are "dumb, spastic nutcases." Paduano favors the white Pekin ducks, which he says are "by far the best behaved" of all the ducks he has raised. "Ducks are funny and cute and won't peck or scratch small children," he adds.

And yet even with more people discovering the delights of raising ducks, the eggs remain difficult for the average consumer to find. The owners of backyard ducks are mostly keeping those eggs to themselves -- for now.

Copyright 2014 NPR.

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Move Over Chickens, Here's Something Duckier For The Backyard