People who keep llamas as pets will readily offer you any number of reasons: llamas are quiet, they’re gentle and affectionate, they don’t take a lot of work to maintain and, for outdoor animals, they don’t smell bad.

But it’s more than that. Look at a llama and it’ll gaze back sympathetically with those huge, beguiling eyes, ears perked up, looking for all the world like it understands you and really cares about your problems.

Most people start with two or three, since llamas are sociable and don’t like to live alone. But as Katrina Capasso, a llama owner in Ballston Spa, N.Y., discovered, “They’re like potato chips.” It’s hard to stop at just a few. Capasso, 49, received her first llama as a wedding gift from her husband, Gary, in 1990. Now she has 55.

That irresistible quality may explain their popularity as pets. A few decades ago, they were almost unheard-of in this country. Today there are about 115,000 in the U.S., according to the International Lama Registry, which keeps genealogical records.

Alpacas vs. llamas

The population of alpacas, their smaller cousins bred primarily for fleece, is about the same, according to the Department of Agriculture. But alpacas are beasts of burden and have a very different gestalt. Do not get a llama owner started on alpacas.

“Llamas are like dogs: they are your friend,” said Pam Fink, who keeps 13 pet llamas at her home in Georgia and is expecting three babies in August. “Alpacas are more like sheep. They’re not going to play with you, not going to be your friend.”

Llama breeders have been known to pay as much as $30,000 for a top-quality male, but a regular pet llama can be had for less than $500. And given the demand for llama fiber, which is as highly prized by knitters as alpaca, you might be able to earn some of that back.

That is, unless you live in Manhattan, or anywhere else that isn’t zoned for livestock. But if you’re fortunate enough to live in the right place and you have some outdoor space, as Fink’s husband, Jerry, will tell you, “Llamas will steal your heart.”

He and his wife like to spend summer nights sitting on their screened porch, watching the llamas graze. “I refer to them as our walking lawn ornaments,” he said.

Jerry Fink, 65, a businessman, and his wife, also 65, and a former mortgage broker, got their first three llamas a decade ago. And Pam Fink soon found her calling as a breeder of miniature llamas, a distinct breed about three-quarters the size of standard llamas.

In the Finks’ immaculate suburban house, framed portraits of their pet llamas hang over the fireplace alongside photos of their grandchildren. Another wall is covered with ribbons won at llama shows, which are similar to dog shows.

On a recent spring morning, Pam Fink showed a visitor around the house and then gave a tour of the barns where the llamas live, offering a running commentary on their quirks and personalities.

“This is Dolly,” she said, filling the brown mini-llama’s bucket with minerals. “She likes to eat in front of the window.” (Llamas are picky eaters and prefer hay, grass, minerals and grain; some owners say they cost about the same to feed as big dogs.)

Cheerio, she said, moving on to a miniature female with a white-and-brown coat, is timid with strangers, “but will follow me around like a puppy dog.”

As she spoke, Fink touched each of the llamas, hugging their faces, lifting their feet and fluffing the fur on their haunches, her way of making sure that all of them have daily human contact. “I require my animals to be well-mannered,” she said. “They have to walk on a lead, they have to be nice to people, they have to behave.”

Llamas are strictly outdoor animals, and males must be kept separate from females, otherwise they will mate nonstop. In other matters, however, they are very restrained. Owners must check them carefully to see if they are hurt or sick, because llamas are so stoic they seldom complain. If they don’t have health problems, they can live for decades.

And those stories about spitting, most llama owners will tell you, are exaggerated: llamas will spit at other llamas to establish social hierarchies, but unless they feel threatened, they rarely spit at people.

“Llamas are intelligent, and they’re very curious,” Pam Fink said. “They’re standoffish at first, and then they’re in your face.”

Llamas are generally quiet, but that doesn’t mean they don’t make any noise. When a male is interested in a female, or mating, he makes a noise that sounds a bit like gargling. Female llamas make clicking sounds. And all llamas hum; in particular, mothers hum to their babies, which hum back.

It’s part of the bonding process, said Susan Morgan, 54, a home-care nurse in Hastings, Minn., who breeds miniature llamas with her husband, George, 56, an engineer. “They recognize each other by the hum,” she said. Two months after one of her females gave birth, Morgan said, they were still humming at each other.

Pam Fink has a cat and two Great Pyrenees dogs, but it is her llamas, she said, that offer her the most comfort. “When I can’t take people anymore, I go out to the barn,” she said. “I can just feel my heart rate go down. They have all of the good things about dogs, but none of the hyperness.”

So it should come as no surprise that some llamas dispense that comfort professionally. Ambassador llamas visit schools, churches and libraries; therapy llamas spend time with the sick, elderly and disabled. And at some llama shows, there is a category called public relations, in which a llama’s ability to offer solace is evaluated through tasks like lowering its head to greet someone in a wheelchair.

That capacity, some believe, stems from an innate intuition. Robin H. Turell, 55, a former special education teacher who breeds llamas in Cypress, Texas, said: “Llamas have an amazing sixth sense. They are very good with people with special needs.”