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."

12 Memorable Facts About Elephants

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iStock.com/Gilitukha

Known for their strong family bonds and intelligence, elephants have fascinated humans across time and cultures. As the largest living land mammal, a male African bush elephant typically stands more than 10 feet tall and weighs an incredible 6.6 tons. Although poachers still kill approximately 100 African elephants every day, conservation groups are working to save elephant populations from extinction. Read on for a dozen things you might not know about elephants, from their long history as a political symbol to their legit firefighting skills.

1. Contrary to popular belief, they're not exactly scared of mice.

Baby elephant looks startled.
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Cartoonists have long depicted the funny juxtaposition of a giant elephant terrified of a tiny mouse. Zoologists and elephant trainers have conducted experiments to test whether elephants are truly afraid of rodents, and it seems to be a myth. Mice themselves don't frighten elephants, but the pachyderms have poor vision and can get extremely startled when anything suddenly scurries by. Elephants are probably more afraid of a mouse's sudden movement than the mouse itself.

2. Wild elephants could have populated the U.S., but Lincoln nixed the idea.

A mother and baby elephant taking a walk.
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In 1861, President Lincoln received gifts, including elephant tusks and a handmade sword, from Siam's King Somdetch Phra Paramendr Maha Mongkut. The king of present-day Thailand also made an interesting offer: Mongkut proposed that Siam would send pairs of male and female elephants to the U.S. to breed in the forests. Americans could then tame the wild elephants and put them to work for the economic benefit of the country. William Seward, Lincoln's secretary of state, replied to Mongkut in 1862, graciously declining his offer. He told the king that since the U.S. already used steam power to efficiently transport goods within the country, elephants simply wouldn't be practical.

3. The elephant equivalent of thumb-sucking is trunk-sucking.

Baby elephant sucking its trunk.
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When baby elephants want to comfort themselves, they instinctively start sucking their trunks. Trunk-sucking is also a way that a baby elephant can learn how to use her trunk (which contains between 40,000 and 50,000 muscles). Although most elephants, like human babies, grow out of sucking behavior, some adult elephants also suck their trunks when they feel anxious.

4. They've been the symbol of the Republican Party since 1874.

Elephant symbol for the Republican party.
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Although elephants had been occasionally used as a symbol for Republicans during the Civil War, cartoonist Thomas Nast, who drew an elephant in an 1874 issue of Harper's Weekly, gets the credit for linking the animal with the political party. In later cartoons, Nast continued to draw an elephant to portray the Republican Party, and other cartoonists adopted it, establishing the animal as the GOP symbol.

5. Barnum & Bailey trained elephants to play baseball.

U.S. stamp with a circus elephant on it.
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Baseball is America's pastime, so why not teach elephants how to play the game? In 1912, thanks to the work of Barnum & Bailey's elephant trainer, Harry L. Mooney, the intelligent animals played their first ballgame. Although playing baseball was just one of many tricks that circus elephants learned, Barnum & Bailey capitalized on the concept of elephant baseball by using the image on posters to sell tickets for shows.

6. Some elephants have been convicted of murder.

Elephant foot in chains.
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Although elephants are typically viewed as gentle giants, they are capable of attacking and killing humans. Male elephants undergo musth, a hormonal change that makes them temporarily produce tons of testosterone, resulting in aggression. But even female elephants can kill. In 1916, a town in Tennessee charged an elephant named Big Mary with first-degree murder for killing her handler. Big Mary, who worked for the Sparks Circus, attacked her handler, possibly after he struck her with a bullhook as she was trying to eat a watermelon rind. Big Mary was convicted and sentenced to execution. Some 2500 residents of the town gathered to watch Big Mary's dramatic hanging, which featured a 100-ton crane and a chain that broke under her weight.

7. They grieve death.

Elephants mourning the death of a baby elephant.
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Although we can't know exactly what elephants feel and how they process death, they seem to show signs that they experience grief when a member of their family (or another elephant) dies. When they see a dead elephant, they may vocalize, use their trunks to "hug" the dead animal, or stay with the carcass for hours. Some elephants have also tried to bury the dead body by covering it in leaves and soil.

8. Trained elephants fight fires in Indonesia.

Elephant with water spewing out of its trunk.
Ishara S.KODIKARA, AFP/GettyImages

You probably won't see an elephant riding on a fire truck anytime soon, but elephants in Indonesia are a vital part of fighting fires. In 2015, East Sumatra was plagued with multiple fires over a period of several months, so 23 trained elephants from a conservation center went to work. Carrying water pumps and hoses, the elephants helped patrol the land and made sure that new fires weren't ignited.

9. You might see them stroll through your hotel's lobby in Zambia.

An elephant walks into the lobby of the Mfuwe Lodge in Zambia.
An elephant walks into the lobby of the Mfuwe Lodge in Zambia.
Lars Plougmann, Flickr // CC BY-SA 2.0

Some guests at Mfuwe Lodge in the African country of Zambia get an unusual animal sighting before they even leave the lobby. Each year between October and December, families of elephants walk through the lodge's reception area to eat wild mango from a tree in the courtyard. The elephants' giant size and seeming indifference to their hotel lobby surroundings make for quite a striking sight.

10. In 2015, scientists recorded them yawning for the first time.

An elephant's open mouth.
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Although scientists speculated that elephants probably yawn, scientists from the University of California, Davis captured the first video of an elephant yawning. If you enjoy watching sleepy animals stretching and yawning, this is for you. Warning: extreme cuteness ahead.

11. Elephants starred in YouTube's first-ever video.

Man taking a photo of an elephant on his phone.
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On April 23, 2005, Jawed Karim made internet history when he uploaded the first video to a certain nascent video-sharing website. Karim, one of YouTube's founders, posted an 18-second scene of himself standing in front of elephants at a zoo. In the video, he speaks about how cool the elephants' long trunks are. As of August 2018, it has more than 53 million views.

12. They snack on old Christmas trees.

Two elephants snacking on pine trees.
VADIM KRAMER, AFP/Getty Images

Zookeepers at Tierpark Berlin, a zoo in Germany, feed unsold Christmas trees to their elephants in early January. The trees are certified pesticide-free, and the elephants seem to enjoy their special snack. Berlin isn't the only place where elephants eat Christmas trees, though. Zoos in Prague also treat their elephants to the tasty conifers.

This story originally ran in 2017.

The 20 Most Pet-Friendly Cities in America

Ramin Talaie/Getty Images
Ramin Talaie/Getty Images

Pet parents have to look at more than just commute times and real estate prices when finding a new place to live. Factors like walkability, the number of parks, and the availability of pet sitters all dictate how comfortable a new city will be for dogs and their owners. If you're looking to make a move with your pooch, pet-sitting site Rover recently teamed up with real estate website Redfin to determine the best cities for dog lovers.

Together, the companies looked at a number of different metrics, like how easy it is to walk in each city, the concentration of dog walkers and sitters there, and the number of homes for sale with the word dog in the listing. And to measure the quality of a city's pet services, Rover broke down the total hours, minutes, and distance per walk given by the dog walkers in its system.

The report found there are dog-friendly cities across the country. Seattle ranked at the very top, followed by Chicago, Denver, and Manhattan. Cities throughout the South, including Austin, Houston, and Atlanta, also made the list, as did a handful of places in California (including Los Angeles, San Francisco, and San Diego).

You can check out the full round-up of dog-friendly cities below. And when you're ready to make your move, here are some tips for finding a pet-friendly apartment.

  1. Seattle, Washington

  1. Chicago, Illinois

  1. Denver, Colorado

  1. Manhattan, New York

  1. Washington, D.C.

  1. Portland, Oregon

  1. Los Angeles, California

  1. Brooklyn, New York

  1. San Francisco, California

  1. San Diego, California

  1. Philadelphia, Pennsylvania

  1. Houston, Texas

  1. Austin, Texas

  1. Arlington, Virginia

  1. Minneapolis, Minnesota

  1. Alexandria, Virginia

  1. Dallas, Texas

  1. Atlanta, Georgia

  1. San Jose, California

  1. Nashville, Tennessee

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