11 Fascinating Facts About the Frilled Shark

Sometimes called a “living fossil” because it has changed so little since prehistoric times, the eel-like frilled shark—which is rarely seen by humans—has been in the news this week after a snake-like one was found off the coast of Portugal. Here’s a quick primer.

1. IT’S NAMED FOR ITS GILLS.

Its scientific name is Chlamydoselachus anguineus, but this creature’s common name comes from its gills: Unlike all other sharks, which have separate gills, C. anguineus’ first pair of gills go all the way across its throat; each pair is lined at the edges with red “fringe.”

2. IT WAS DISCOVERED IN THE 19TH CENTURY.

The sharks were first scientifically described by German ichthyologist Ludwig H.P. Döderlein, who taught at Tokyo University from 1879 to 1881 and brought two specimens captured in Tokyo Bay when he returned to Vienna. His paper describing the sharks was lost, however, so the first description comes from Samuel Garman in the 1884 edition of the Bulletin of Essex Institute. In the remarks after the description, Garman noted that

Such an animal as that described is very likely to unsettle disbelief in what is popularly called the “sea serpent.” Though it could hardly on examination be taken for anything but a shark, its appearance in the forward portion of the body, particularly in the head, brings vividly to mind the triangular heads, deep-cleft mouths, and fierce looks of many of our most dreaded snakes. In view of the possible discoveries of the future, the fact of the existence of such creatures, so recently undiscovered, certainly calls for a suspension of judgment in regard to the non-existence of that oft-appearing but elusive creature, the serpent-like monster of the oceans.

The frilled shark’s species name, anguineus, is Latin for “consisting of snakes” or “snaky.”

Biologist David A. Ebert, director of the Pacific Shark Research Center, described a second frilled shark species—Chlamydoselachus africana, which lives off the coast of Africa and is about half as long as its predecessor—in 2009.

3. IT’S GOT INSANE TEETH.

The frilled shark’s mouth is just as terrifying as the maw of a great white: It’s lined with 25 rows of backward-facing, trident-shaped teeth—300 in all. “The teeth are constructed for grasping and from their peculiar shape and sharpness it would seem as if nothing that once came within their reach could escape them,” Garman wrote. “Even in the dead specimen the formidable three-pronged teeth make the mouth a troublesome one to explore.” 

Ebert can testify to that fact. “I can tell you from snagging my fingers on the teeth, you can only back out one way and that’s in toward the mouth and then out,” he told WIRED. “It didn’t feel good, I can tell you that.” The shark uses the bright white teeth, which sharply contrast against its brown body, to lure in prey: “By the time [the prey] realize, Oh, that’s the teeth of a shark, they’re too close and the shark is able to ambush them at that point,” Ebert said. “It’s almost like when you drive out of a parking lot exit and they have the spikes sticking out that say, ‘Do not back up.’ That’s kind of what happens when these things catch prey items.”

And as if its teeth weren’t freaky enough, the frilled shark has spines, called dermal denticles, lining its mouth. So if you happen to see one of these anywhere, it’s better to look and not touch.

4. IT “HOVERS” IN THE WATER...

Scientists once believed that the frilled shark wriggled through the water like an eel. But according to the ReefQuest Centre for Shark Research, “its body cavity is elongate and packed with a huge liver perfused with low-density oils and hydrocarbons, making the shark almost neutrally buoyant at depth.”

5. … AND IT MAY STRIKE AT ITS PREY LIKE A SNAKE.

No one has ever observed the frilled shark hunting, but scientists believe that it uses its posterior fins as propulsive surfaces to launch itself at its prey. Its long jaws, which terminate at the back of its head, may allow the animal to gape extra wide and take in prey half as long as its body. Analysis of the stomach contents of captured specimens has revealed that the frilled shark’s diet is 61 percent cephalopod, 11 percent teleost fishes, and, occasionally, other sharks.

6. IT’S FOUND ALL OVER THE WORLD—BUT YOU PROBABLY WON’T SEE IT.

The Food and Agriculture Organization of the United Nations notes that the frilled shark is “wide-ranging but spottily distributed”; you can see where the shark is found on the map above. It typically resides in depths between 390 and 4200 feet, so people rarely see these sharks unless they venture to the surface, which isn’t unheard of (as you’ll see below).

7. FEMALES ARE BIGGER THAN MALES.

On average, males range from 3.2 to 3.6 feet and females from 4.4 to 4.9 feet; the maximum these sharks can reach is 6.4 feet.

8. THEIR GESTATION PERIOD MAY BE 3.5 YEARS LONG.

A study of frilled sharks in Japan revealed that the animals breed year-round; litters typically consist of six pups, which emerge from eggs while still in the mother’s uterus and are then born live. Scientists think the shark may have the longest gestation period ever: Frilled sharks could gestate for as long as 42 months, nearly twice as long as African elephants carry their young. Scientists theorize that the extreme length has something to do with the shark’s cold deep sea habitat.

9. IT WASN’T SEEN IN ITS NATURAL HABITAT UNTIL 2004.

NOAA scientists exploring the “Latitude 31-30 Transect” in the Atlantic Ocean captured a video of a frilled shark “swimming over sea bottom that was covered with tiny sand dunes” during a submersible dive. “This species has been, on rare occasion, caught or taken in bottom trawls,” the site notes. “To the knowledge of everyone on board, however, this was the first time anyone had ever seen the rare species in its natural habitat.”

10. ONE WAS CAPTURED IN JAPAN IN 2007.

In January 2007, a Japanese fisherman spotted a strange, eel-like creature with a mouth full of sharp teeth near the surface; he alerted the staff of the Awashima Marine Park in Shizuoka, who captured the animal and transferred it to a seawater pool, where they filmed it. “We think it may have come close to the surface because it was sick, or else it was weakened because it was in shallow waters,” a park official said. “We believe moving pictures of a live specimen are extremely rare. They live between 600 and 1000 meters under the water, which is deeper than humans can go.” The shark, a female, died a few hours after its capture.

11. IT CALLS ANOTHER FREAKY SHARK ITS COUSIN.

The frilled shark might have rows upon rows of gnarly teeth, but its cousin, the goblin shark, can thrust its jaw out of its face. Which is more terrifying?

12-Year-Old Is Making Bow Ties for Shelter Dogs In Order To Help Them Find Their Forever Homes

GlobalP/iStock via Getty Images
GlobalP/iStock via Getty Images

At 2 years old, New Jersey native Darius Brown was diagnosed with delays in comprehension, speech, and fine motor skills. At 12, he’s already founded a company, spoken to a national news corporation, and sewn hundreds of bow ties.

Brown's company, Beaux and Paws, donates the bow ties he creates to shelters to help animals get adopted, Today reports. The hope is that since dogs and cats sporting bow ties are so unbelievably adorable, people won’t be able to resist taking them home. It combines two of Darius’s passions, fashion and animals, and the idea was years in the making.


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When Brown's sister, Dazhai Brown-Shearz, was creating girls’ hair ribbons in cosmetology school, she and their mother Joy Brown decided to involve then-8-year-old Darius in the process, thinking it might help him exercise his fine motor skills and also have a positive impact on other tasks he struggled with, like tying his shoes.

It worked, and it also ignited an enthusiasm for style and design that extended beyond hair ribbons: Brown began sewing festive, vibrant bow ties for himself, which he told Today he wears “literally everywhere.” People started stopping Brown on the street, asking where they could purchase them. Then, when the pre-teen learned about how shelters couldn’t accommodate all the animals displaced by hurricanes Harvey and Irma, he had an idea for how to increase adoptions. Brown sent batches of bow ties to the American Society for the Prevention of Cruelty to Animals (ASPCA), and has since expanded his shipments to shelters all over the country.


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With more than 47,000 Instagram followers and a personal letter of commendation from former President Barack Obama, Beaux and Paws has grown exponentially since its inception, and Darius no longer needs to pay for supplies out of pocket; his GoFundMe campaign has raised more than $11,000. Brown is planning to put some of that money toward a summer trip that will take him to five different states, so that he can deliver his bow ties to shelters and assist with adoption events personally.

“We’re definitely very proud of Darius,” his mom told Today. “He’s overcome a lot and he’s still on his journey of overcoming a lot of things. He just keeps going for what he believes in.”

[h/t Today]

10 Quick Facts About Roadrunners

MikeLane45/iStock via Getty Images
MikeLane45/iStock via Getty Images

Anyone who was raised on Looney Tunes cartoons might be surprised to find out that roadrunners aren’t long-necked or purple-crested—but roadrunners and coyotes do occasionally engage in chases. Here are a few fast facts about these unusual desert birds.

1. Roadrunners are members of the cuckoo family.

Found in deserts, grasslands, and forests, the greater roadrunner (Geococcyx californianus) cruises through the southwestern U.S. and northern Mexico. Its slightly smaller relative, the lesser roadrunner (Geococcyx velox), is generally found further south. Both birds belong to the cuckoo family, Cuculidae, which also includes anis and malkohas. All the members of the family have zygodactyl feet, with two forward-facing and two backward-facing toes. The arrangement gives roadrunners X-shaped footprints.

2. Roadrunners are fast—but coyotes are faster.

Greater roadrunner in a desert habitat
RONSAN4D/iStock via Getty Images

According to The Real Roadrunner by Martha Anne Maxon, scientists have clocked the speedy birds running at 15 to 20 miles per hour. Coyotes can run twice as fast as even the fastest roadrunners, but luckily for the birds, coyotes would just as well dine on small rodents, plants, and lizards instead of birds.

3. Flying isn’t the roadrunner’s forte.

Most of the time, roadrunners get around on foot, but taking flight is an option too. Roadrunners will sometimes glide down to Earth from tree branches or canyon rims, but they’re limited to short-distance powered flights because their wings are weak and their muscular legs weigh them down. To get airborne, they usually need a running start.

4. Lizards, seeds, and hummingbirds are on the roadrunner’s menu.

Opportunistic and omnivorous, roadrunners will eat seeds, cactus fruit, snails, snakes, lizards, insects, arachnids, and rodents. Smaller birds are fair game, too. Roadrunners will sometimes lurk around birdfeeders and, with a great leap, snatch songbirds in midair. Wildlife photographer Roy Dunn recently filmed a roadrunner capturing a hummingbird at his backyard feeder.

5. Roadrunners can out-maneuver striking rattlesnakes.

Roadrunners have no fear of venomous rattlesnakes—in fact, they find them delicious. But hunting one takes patience. When the two beasts face off, the roadrunner will fan its wings, which makes the bird look bigger and more threatening. As the snake strikes, the roadrunner nimbly leaps out of the way. This happens over and over until the bird, having learned the snake’s routine, grabs it by the back of the head in mid-strike. Then the roadrunner bashes the snake against the ground until it’s subdued or dead. Since they don’t have talons and their beaks aren’t equipped to rip through flesh, roadrunners swallow snakes whole.

6. Puebloan peoples believe roadrunners ward off dangerous spirits.

Roadrunners are viewed as protective entities among Puebloan peoples in the southwest U.S. Members of these tribes scratched X-shaped symbols designed to look like the birds’ tracks into the earth around dead bodies. The Xs were believed to secure them from evil spirits: malevolent beings would get confused because they couldn’t tell which way the roadrunner who left the “footprints” had been headed. Likewise, roadrunner feathers were placed over cradles to protect the babies inside.

7. Roadrunners do not say “beep! beep!”

Male roadrunners emit cooing noises while courting females and defending territories. Both sexes also use barks and growls to communicate—and for unknown reasons, roadrunners like to produce a long series of clicks by snapping their beaks. The clicks might be a message about one’s territory or a signal to broadcast one’s location to others.

8. Greater roadrunners team up to defend their territories.

Greater roadrunner running across a road
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Considered monogamous, greater roadrunners sometimes pair for life. To help maintain the relationship, males periodically dance for their partners. They’ll also offer food and materials that can be used during nest construction. Both parents take turns incubating their eggs, which are laid in clutches of two to six, and they share chick-raising duties later on. Defending the home turf is another task they perform together. A single pair of roadrunners may occupy a huge territory encompassing up to 250 acres.

9. Roadrunners can conserve energy by lowering their body temperatures.

Roadrunners don’t migrate. On cold nights, the birds reduce their own body temperatures by as much as 15°F, which allows them to burn less energy. To help warm themselves back up, the birds like to sunbathe in the early morning [PDF]. They even raise their feathers to expose their skin directly to the sun’s warming rays.

10. The roadrunner is the state bird of New Mexico.

The greater roadrunner was formally chosen to be the Land of Enchantment’s state bird on March 16, 1949. Since then, the anti-littering organization Keep New Mexico Beautiful, Inc. has adopted an anthropomorphic roadrunner named Dusty as its mascot.

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