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Does Wedding Rice Really Make Birds Explode?

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Throwing rice at a newly married couple has been a tradition for thousands of years, possibly going back as far as the ancient Assyrians and Egyptians. The idea is to give the newlyweds good luck, fertility, and abundance using this symbol of a good crop. More recently, wedding meddlers have cautioned against throwing rice because it can kill birds who swoop down and eat it after the human revelers have left for the reception. The rice grains, absorbent as they are, supposedly start sucking up water in the birds’ moist innards and cause them to violently burst.

It's not clear where this idea came from, but it hit the peak of its popularity in the late 1980s when the Connecticut state legislature discussed a bill outlawing the tossing of rice at weddings and advice columnist Ann Landers printed a letter about the practice.

Wherever it came from, you can quit worrying about the birds.

The reality is that rice poses no harm to them. Wild birds eat uncooked rice all the time with no ill effects. Many types of waterfowl, shorebirds, and migratory birds depend on flooded rice fields to maintain fat in the winter. A bird called the bobolink eats enough rice that it's considered a pest by farmers and has earned the nickname "ricebird."

Besides the numerous birds that regularly eat rice and don’t explode, another thing to consider is the fact that dried rice grains are pretty slow to absorb liquid unless it's boiling, which birds’ stomachs certainly aren’t. Their internal temperatures generally range from 100.4 to 107.6 degrees F, well below the boiling point of any liquid that would be inside them. Even if birds did have boiling guts, any uncooked rice they consumed would be broken down well enough by their crops and gizzards that the pieces shouldn’t cause any problems as they expand.

Mythbusters or Gutbusters?

Now, these explanations of why rice is not bad for birds rely on two things: what we know about birds, and what we know about rice. We understand both pretty well, but wouldn’t a good experiment go a long way toward putting the myth to rest?

That’s what James Krupa’s students at the University of Kentucky thought. During the spring 2002 semester, Krupa and his 600 biology students decided to test the exploding bird myth with a series of experiments. They looked at the expansion of different types of grains, considered the strength of birds’ digestive organs, and tested an all-rice diet out on the professor’s pet birds.

The first notable thing they found was that white rice increased in volume by 33% when soaked, while bird seed expanded by 40%. If rice was going to make birds explode, then we’d already doomed them anyway with birdfeeders full of seed. The most significant expansion was seen in white and brown instant rice, which expanded 2.4 to 2.7 times its original volume when soaked. Of course, instant rice is usually more expensive than the regular stuff and comes in smaller quantities, so it's not very likely that anyone is throwing around opened packages of Uncle Ben’s at weddings.

But what if they did? To see if instant rice could burst a bird from the inside out, Krupa and his students built model bird crops from very thin plastic and from wet paper bags, and filled them with various grains and water. None of the plastic crops exploded, but a paper bag filled with instant white rice expanded and ruptured in about 15 minutes.

Not satisfied with their bird-gut surrogates, the students begged Krupa to test the rice out on real birds. Krupa felt confident enough that no birds would be harmed based on their previous results, so he agreed to turn the flocks of doves and pigeons he kept at home into guinea pigs. He fed 60 of his birds a diet of nothing but instant rice and water for a day, and monitored them for signs of distress or discomfort. Krupa reported that no birds choked, exploded, or otherwise were injured or died. None of them threw up or even showed any sign that they were in pain; they went through their all-rice day with no problems.

Birds, it seems, have no problem with rice, but this doesn’t mean that it's perfectly safe to throw at weddings. Hard, tubular grains spread out on the sidewalk in front of a church can still create a slipping hazard for another animal: wedding guests. The fear of slip and fall injuries and the lawsuits that go with them have led some wedding venues to ban rice—not for the birds, but to keep themselves out of court.

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A Dutch Startup Wants to Train Crows to Pick Up Cigarette Butts
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The tobacco industry produces a lot of cigarettes, and that leads to a lot of filters discarded on the ground. According to Americans for Nonsmokers’ Rights, we end up with 1.69 billion pounds of them each year, making cigarette butts the most common type of litter. Plenty of creative solutions, from musical ash trays to roads made from cigarette waste, have been proposed in the past. Now, a new startup is developing a strategy that takes advantage of something that’s already a part of our cities. As The Next Web reports, Crowded Cities wants to train urban crow populations to pick up our cigarette butts.

We already know that crows enjoy picking at the garbage humans leave on the ground and in cracks and crevices. Crowded Cities founders Ruben van der Vleuten and Bob Spikman wondered if they could redirect this habit and turn crows into tiny garbage collectors. Training crows to do something as specific as identifying and transporting cigarette butts isn’t as crazy as it may sound. The corvids are among the most intelligent creatures in the animal kingdom—they’re capable of using tools, nursing grudges, and even holding funerals.

But even if crows were capable of learning the task, the team needed to find an efficient way to train them. That’s when they came across the Crow Box: an open-source project designed by Joshua Klein that acts like a vending machine for crows. Whenever a crow deposits a coin in the device, it rewards them with a peanut, thus teaching the birds to hunt for change. Spikman and van der Vleuten adopted this concept, swapped butts for the coins, and renamed it the Crowbar.

Crow flying toward machine.
Crowded Cities

The training process starts by attracting crows to the machine with a piece of food next to a cigarette butt. Knowing that a snack will always be there waiting for it, the crow is conditioned to return for more. After this step repeats a few times, the food is moved inside the device and isn’t made available to the crow until the moment it lands. The animal now knows that the machine can give it food in response to its actions.

At a certain point, the Crowbar stops releasing the food automatically. The only way for the crow to get fed is by nudging the cigarette butt into the receptacle. If it's able to figure this step out, the idea is that it will start scouring for cigarettes elsewhere as payment for its meal.

The project is still a far way off from becoming a reality in major cities. Crowded Cities is looking for ways to fund trial runs, and if those are promising it will still need to conduct research into the harmful effects cigarette butts may pose to crows. As for the skeptics who don’t believe crows can pull off such a sophisticated feat, the startup’s founders encourage them to take a “Sunday morning to browse through some crow videos on YouTube.”

Here’s one example they selected for your viewing pleasure.

[h/t The Next Web]

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12 Fascinating Facts About Crows
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Crows often get a bad rap. In many Western cultures, they've historically been associated with death, disease, and bad omens, reviled as crop-stealers by farmers, and condemned as nuisances by city dwellers. But the birds are fascinating creatures, adaptable and brainy to an extent that's almost scary. Here are a few facts about the corvids that might surprise you.

1. ALL CROWS AND RAVENS BELONG TO THE SAME GENUS.

Members of the Corvus genus can be found on every continent except Antarctica and South America (although other close relatives live there). To date, scientists have named 40 species. Colloquially, some of them are referred to as ravens while others are called crows or jackdaws.

Historically, the name raven has been given to several of the big-bodied Corvus birds with shaggy feathers on their necks. Mid-sized members of the genus are usually called crows, while the very smallest species go by the name jackdaws. There's also a large-beaked outlier known as the rook, which was named after the unusual sound it makes. But pervasive as these labels may be, they're not scientific and do not reflect the latest research. Despite its informal name, the so-called Australian raven is more closely akin to the Torresian crow than it is to the common raven.

In the U.S., when people talk about crows and ravens, they're usually referring to the American crow (Corvus brachyrhynchos) and the common raven (Corvus corax). Telling them apart can be tough, but it is possible for eagle-eyed birders. One big indicator is size: The common raven is much larger, about the size of a red-tailed hawk. It also has a more wedge-shaped tail. As Kevin J. McGowan of the Cornell Lab of Ornithology writes on his crow FAQ page, ravens soar longer than crows, and you can see through their wing feathers as they fly (among other differences). And the birds' calls are substantially different. "American crows make the familiar caw-caw, but also have a large repertoire of rattles, clicks, and even clear bell-like notes," McGowan writes, whereas common ravens have "a deep, reverberating croaking or gronk-gronk. Only occasionally will a raven make a call similar to a crow's caw, but even then it is so deep as to be fairly easily distinguished from a real crow."

You can hear crow vocalizations here and raven vocalizations here.

2. OLDER SIBLINGS CAN HELP THEIR PARENTS RAISE NEWBORN CHICKS.

Like a lot of intelligent animals, most crows are quite social. For instance, American crows spend most of the year living in pairs (they usually mate for life) or small family groups. During the winter months, they'll congregate with hundreds or even thousands of their peers to sleep together at night in a sprawling communal unit called a roost.

Come nesting season, a mated pair of crows might be lucky enough to receive chick-rearing help. Juvenile birds are frequently seen defending their parents' nest from predators. Other services they can provide include bringing food to mom and dad, or feeding their younger siblings directly. One study found that 80 percent of American crow nests surveyed had a helping hand. And some birds become regular nest assistants, providing aid to their parents for over half a decade.

3. WHEN A CROW DIES, ITS NEIGHBORS MAY THROW A FUNERAL.

The sight of a dead crow tends to attract a mob of a hundred or more live ones. During this ritual, the live crows almost never touch the dead one, which rules scavenging out as a motive. Why do they do this? Some studies suggest that the mass gathering is part of a survival strategy: The birds are learning about threats and seem hesitant to revisit any spot where they've encountered a dead crow, even if food is plentiful there.

4. THEY'VE CAUSED BLACKOUTS IN JAPAN.

Since the 1990s, crows have experienced a population boom in Japan, where—not coincidentally—delicious garbage is more plentiful than ever before. This is bad news for power companies. Urban crows like to nest on electric transformers and will often use wire hangers or fiberoptic cables as building materials for their nests. The result was an epidemic of crow-caused blackouts in major cities around Japan: Between 2006 and 2008, the corvids stole almost 1400 fiberoptic cables from Tokyo power providers, and according to the Chubu electric company, crows are responsible for around 100 power failures per year in their facilities alone.

To fight back, Chubu started installing artificial "love nests" in 2004. Made with non-conductive resin, the nests are placed on company towers high above the power lines, where the birds are unlikely to cause any trouble. The strategy seems to be working: 67 percent of the faux nests are currently in use, making life a lot easier for Chubu employees.

5. PROPORTIONALLY, THE BRAINS OF SOME CROWS ARE BIGGER THAN YOURS.

According to McGowan, crows are "smarter than many undergraduates, but probably not as smart as ravens."

Crows are so smart and so good at improvising that some zoologists admiringly call them "feathered apes." And yet, from a primate's perspective, crow brains might look puny. The New Caledonian crow, for example, has a brain that weighs just 0.26 ounces. But relative to its body size, that brain is huge, accounting for 2.7 percent of the bird's overall weight. By comparison, an adult human's three-pound brain represents 1.9 percent of their body weight.

Of all the living birds, crows, ravens, and parrots have the biggest brain-to-body size ratios. And in lab experiments, these avians show a degree of cognition that puts them on par with the great apes. In fact, research has shown that they have a much higher density of neurons in their forebrains than primates do. The amount of neurons in this region is thought to correlate with a given animal's intelligence. Theoretically, having more neurons translates to better cognitive reasoning. Thus, it looks like crows, ravens, and parrots have enviable minds indeed.

6. CROWS HAVE REGIONAL DIALECTS—WHICH THEY CAN DELIBERATELY CHANGE.

Apart from the famous caw, caw noise, crows emit a number of other sounds. Each one sends out a different message; for example, cawing can be used as a territorial warning—or a way for crows to signal their location to relatives.

This avian language isn't homogeneous; two different populations of crows may have slight differences. As ornithologist John M. Marzluff and author Tony Angell noted in their 2005 book In the Company of Crows and Ravens, the calls these birds use "vary regionally, like human dialects that can vary from valley to valley." And there's more: If a crow changes its social group, the bird will try to fit in by talking like the popular guys. "When crows join a new flock," Marzluff and Angell wrote, "they learn the flock's dialect by mimicking the calls of dominant flock members."

7. CERTAIN CROWS KNOW HOW TO READ TRAFFIC LIGHTS.

In Japan, carrion crows (Corvus corone) use cars like oversized kitchen appliances. The birds have learned to take walnuts—a favorite treat—over to road intersections, where they put the hard-shelled snacks down onto the pavement. The crow then waits for a passing vehicle to smash the nut, after which it will swoop down and eat the delicious interior.

It's a risky trick, but the crows aren't usually run over because (unlike some people) they've figured out what traffic lights mean. Carrion crows wait until the light turns red before flying down to place the un-cracked nut on the road. The second the light goes green, the crow takes off to watch the nut get run over from afar; it will even wait for the next red to scoop up the nut's insides.

This behavior isn't limited to just one corvid species: American crows have been observed doing the same thing in California.

8. THEY CAN RECOGNIZE YOUR FACE—AND HOLD A GRUDGE.

You don't want a crow for an enemy. In 2011, a team from the University of Washington published a remarkable study about the brainpower of local crows. The researchers' goal was to figure out how well the birds could identify human faces. So—in the name of science—they went out and bought two Halloween masks: One resembled a caveman, the other looked like Dick Cheney. It was decided that the caveman getup would be used to threaten the birds, while the Cheney mask was relegated to control status.

At the five sites, a scientist donned the caveman mask before catching and banding some wild crows. Getting trapped is never a fun experience, and upon their release, the ex-captives loudly "scolded" their assailant with a threatening caw. Seeing this, other birds who had been sitting nearby joined in the fray, swooping down to harass the neanderthalic visitor. Over a period of several years, both masks were regularly worn by team members on strolls through all five test spots. Without fail, the caveman mask was greeted by angry scolds and dive-bomb attacks from crows—including many who'd never been captured or banded—while the birds largely ignored the Dick Cheney mask.

Amazingly, the caveman disguise continued to provoke a hostile response five years into the experiment—even though the team had stopped trapping crows after those first few site visits. And some of the birds who antagonized the mask-wearer weren't even alive back when the whole thing started. The younger crows couldn't possibly have seen the imitation caveman grab an acquaintance of theirs—but they scolded it anyway. Clearly, the grudge had been passed on; birds were still attacking the mask as recently as 2013.

The moral of this story? Mind your manners around crows. Because if you mistreat them, they won't forget you and neither will their friends—or the next generation.

9. NEW CALEDONIAN CROWS MAKE AND USE TOOLS.

Lots of non-human animals, including chimpanzees and orangutans, create useful implements which help them survive in the wild. The New Caledonian crow (Corvus moneduloides) is one of only two species on the planet that can craft its own hooks in the wild. The other is called Homo sapiens. The South Pacific avian uses the hooks—which are made from pliable twigs that the crows bend using their beaks and feet into a J-shape—to extract insects from tight crevices.

Another surprising attribute is this species' weirdly shaped maw. Unlike virtually all other birds, the New Caledonian crow has a bill that does not curve downwards. For years, the quirk went unexplained, but scientists now think that the avian's unique beak evolved to help it grasp tools more easily, as well as to better see what the tool is doing.

The New Caledonian crow isn't the only implement expert in the corvid family. In 2016, scientists at the University of St. Andrews demonstrated that the ultra-rare Hawaiian crow, or ‘Alalā (Corvus hawaiiensis), is similarly adept at using and modifying tools.

10. THE BIRDS FIGHT OFF PREDATORS BY GANGING UP ON THEM.

Crows have to deal with a menagerie of predators, such as hawks, owls, coyotes, and raccoons. To ward them off, the corvids exploit the fact that there can be strength in numbers. Upon seeing a would-be attacker, crows are known to gather en masse, with some groups consisting of a dozen birds or more. Individual crows then swoop down to deliver passing blows with their beaks, often inflicting serious bodily injury in the process. If all goes well, the target will back off—though it may kill a few of the dive-bombers before they retreat. Of course, corvids are by no means the only avians that mob would-be attackers. Swallows, chickadees, and even hummingbirds have all been documented doing this. In fact, crows are sometimes at the receiving end of mob violence as smaller songbirds often feel threatened by them and lash out collectively.

11. CORVIDS UNDERSTAND A THING OR TWO ABOUT IMPULSE CONTROL.

A 2014 study shows that at least some corvids can resist the urge for instant gratification—if you make it worth their while. The research was led by University of Göttingen graduate student Friederike Hillemann, whose team assembled five common ravens and seven carrion crows. Through careful note-taking, the scientists figured out what the favorite meal items of all 12 animals were. Then the experiment began.

With an outstretched hand, one of the researchers gave each of their birds a morsel of food. Then, the animals were shown a different piece of grub. The corvids were made to understand that if they liked the second option better, they could swap snacks—but only if they were willing to sit patiently for a certain period of time first. If a bird ate the original treat during that stretch, it forfeited the chance to trade it for a new one.

Hillemann's results showed that the crows and ravens didn't mind waiting around for an improved snack option. As such, a bird with a piece of bread was content to sit quietly if it knew that some fried pork fat would eventually be gained in the trade-off. However, if that same bird's second choice was another piece of bread, sitting tight would be pointless. So understandably, corvids who were put in this kind of situation tended to go ahead and eat whatever they'd been given. Why wait for more of the same?

12. YOU CAN CALL A GROUP OF CROWS A MURDER, BUT SOME SCIENTISTS WOULD RATHER YOU DIDN'T.

According to the Oxford English Dictionary (OED), the correct term for a group of crows is a murder, an expression bird-watchers and poets have been using since at least the 15th century, which the OED speculates may allude "to the crow's traditional association with violent death, or … to its harsh and raucous cry." But maybe it's time to come up with a replacement. McGowan hates the phrase "murder of crows." To him, it only feeds the public's negative outlook on the animals. "These birds aren't a gang of nasty villains," he wrote in the book Birdology. "These birds are just birds." McGowan would also have you know that American crows rank among "the most family-oriented birds in the world."

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