CLOSE
Original image
Nevil Lazarus

Signature Song keeps Fairy-Wren Moms from Being Fooled

Original image
Nevil Lazarus

Talk about "singing for your supper": New research shows that fairy-wren chicks have to sing a specific song to their mother or she will refuse to feed them. It's not that the mama birds are music critics; the song actually stops cuckoo birds from taking advantage of the fairy-wrens' maternal instincts.

Because cuckoo birds frequently lay their eggs in the nests of fairy-wrens—and feeding these invaders is a costly waste of resources—the mother teaches her unborn chicks (that's right, while they're still in their eggs) a particular song to sing when feeding time arrives. If the birds don't sing the tune, they won't get any food. If none of the chicks sing the song, she will assume the nest is overrun with cuckoo chicks and abandon it.

Each mother has her own particular song to teach her chicks, and if mates or other birds help her to feed them, she will teach those birds the password as well—out of earshot of the nest—to further ensure no intruding chicks receive valuable nutrients.

According to io9, which has more information on the study, this strategy is pretty remarkable; that this trait evolved "shows just how versatile and exploratory nature can be when confronted with a problem. But given how detrimental brood parasitism is to the host bird's reproductive fitness, it shouldn't come as a surprise that evolution found a way."

Original image
iStock
arrow
Animals
Owning a Dog May Add Years to Your Life, Study Shows
Original image
iStock

We've said that having a furry friend can reduce depression, promote better sleep, and encourage more exercise. Now, research has indicated that caring for a canine might actually extend your lifespan.

Previous studies have shown that dog owners have an innate sense of comfort and increased well-being. A new paper published in Scientific Reports and conducted by Uppsala University in Sweden looked at the health records of 3.4 million of the country's residents. These records typically include personal data like marital status and whether the individual owns a pet. Researchers got additional insight from a national dog registry providing ownership information. According to the study, those with a dog for a housemate were less likely to die from cardiovascular disease or any other cause during the study's 12-year duration.

The study included adults 40 to 80 years old, with a mean age of 57. Researchers found that dogs were a positive predictor in health, particularly among singles. Those who had one were 33 percent less likely to die early than those who did not. Authors didn't conclude the exact reason behind the correlation: It could be active people are more likely to own dogs, that dogs promoted more activity, or that psychological factors like lowered incidences of depression might bolster overall well-being. Either way, having a pooch in your life could mean living a longer one.

[h/t Bloomberg]

Original image
iStock
arrow
Big Questions
Why Don't We Eat Turkey Tails?
Original image
iStock

Turkey sandwiches. Turkey soup. Roasted turkey. This year, Americans will consume roughly 245 million birds, with 46 million being prepared and presented on Thanksgiving. What we don’t eat will be repurposed into leftovers.

But there’s one part of the turkey that virtually no family will have on their table: the tail.

Despite our country’s obsession with fattening, dissecting, and searing turkeys, we almost inevitably pass up the fat-infused rear portion. According to Michael Carolan, professor of sociology and associate dean for research at the College for Liberal Arts at Colorado State University, that may have something to do with how Americans have traditionally perceived turkeys. Consumption was rare prior to World War II. When the birds were readily available, there was no demand for the tail because it had never been offered in the first place.

"Tails did and do not fit into what has become our culinary fascination with white meat," Carolan tells Mental Floss. "But also from a marketing [and] processor standpoint, if the consumer was just going to throw the tail away, or will not miss it if it was omitted, [suppliers] saw an opportunity to make additional money."

Indeed, the fact that Americans didn't have a taste for tail didn't prevent the poultry industry from moving on. Tails were being routed to Pacific Island consumers in the 1950s. Rich in protein and fat—a turkey tail is really a gland that produces oil used for grooming—suppliers were able to make use of the unwanted portion. And once consumers were exposed to it, they couldn't get enough.

“By 2007,” according to Carolan, “the average Samoan was consuming more than 44 pounds of turkey tails every year.” Perhaps not coincidentally, Samoans also have alarmingly high obesity rates of 75 percent. In an effort to stave off contributing factors, importing tails to the Islands was banned from 2007 until 2013, when it was argued that doing so violated World Trade Organization rules.

With tradition going hand-in-hand with commerce, poultry suppliers don’t really have a reason to try and change domestic consumer appetites for the tails. In preparing his research into the missing treat, Carolan says he had to search high and low before finally finding a source of tails at a Whole Foods that was about to discard them. "[You] can't expect the food to be accepted if people can't even find the piece!"

Unless the meat industry mounts a major campaign to shift American tastes, Thanksgiving will once again be filled with turkeys missing one of their juicier body parts.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios