105 Fun Facts About Twins

Which term describes identical twins, as opposed to fraternal ones?

Monozygotic twins are the identical kind: one zygote (from Greek zygotos, 'yoked') splits into two embryos, while dizygotic twins each grow from a separate fertilized egg.

Worldwide, roughly one delivery in how many produces twins?

About 1 in 90: a 2021 global study put twinning at 12 per 1,000 deliveries, while identical twins are rarer at roughly 3 to 4 per 1,000.

Roughly how many twin sets per 1,000 births occur among West Africa's Yoruba people?

About 45 twin sets per 1,000 births, roughly 90 twins per 1,000 babies, several times the global average of about 12 sets per 1,000.

A 2011 global study found the highest national twinning rate, 27.9 per 1,000 births, in which country?

Benin topped the 2011 Smits and Monden survey at 27.9 twin deliveries per 1,000; the lowest rates, under 9 per 1,000, were in South and Southeast Asia and Latin America.

Igbo-Ora, nicknamed the 'Twin Capital of the World,' is a town in which country?

Igbo-Ora sits in Nigeria's Oyo State; locals credit the local diet, though researchers have found no proven cause for its twinning rate.

In Yoruba tradition, if the first-born twin is Taiwo, what is the second-born called?

Kehinde, 'the one who came last', is considered the elder, having sent Taiwo out first to check whether the world was fit to enter.

Which Rio Grande do Sul town is nicknamed 'Land of Twins' for its twinning rate?

A theory blaming Nazi doctor Josef Mengele made headlines, but geneticists point to a founder effect among the town's German and Polish settlers, and the twin births predate his arrival.

Do identical twins have identical fingerprints?

Fingerprints are shaped partly by contact with the womb, so each twin touches a different environment and grows unique ridges. Their DNA is nearly identical, though.

Fraternal twins run in families because some women inherit a tendency to do what?

This tendency to hyper-ovulate is genetically linked, which is why fraternal twins cluster in families. Identical twinning, by contrast, has no known genetic link.

By 2011, roughly what share of US twin births were estimated to result from IVF and similar technology?

About 36 percent: fertility drugs and IVF often produce more than one embryo, which is a big reason twin births climbed so steeply from the 1980s onward.

Researchers suspect as many as how many pregnancies begin as multiples but end with a single baby?

Perhaps 1 in 8: in most cases the lost twin is reabsorbed so early that the mother never knew there were two, which is why early ultrasounds keep turning them up.

Fraternal twins with two different biological fathers are the result of a phenomenon with what name?

Heteropaternal superfecundation happens when two eggs released in the same cycle are fertilized by different men; one study of disputed-paternity twin cases found it about 2.4 percent of the time.

Possibly the longest gap between twin births, 97 days, was recorded in which German city?

Cologne's twins arrived in November 2018 and February 2019; delayed-interval delivery keeps the second twin in the womb after the first comes prematurely, so some twins get different birthdays, months or years.

A private language developed by twins that only the two of them understand is called what?

Cryptophasia comes from the Greek for 'secret speech'; it usually fades as the children learn the language everyone else speaks.

Roughly how often do conjoined twins occur?

About 1 in 50,000 pregnancies; most conjoined twins are girls, by a ratio of about three to one, and the most common type is joined at the chest.

As of 2019, how many cases of semi-identical 'sesquizygotic' twins had been documented?

Only two: the second case, in Brisbane in 2019, showed the twins shared 100 percent of maternal and about 78 percent of paternal DNA, the result of one egg fertilized by two sperm.

Chang and Eng Bunker, the original 'Siamese twins', were born in Siam, now called what?

Siam became Thailand in 1939; the brothers settled in North Carolina, married two sisters, and fathered 21 children between them, none of them conjoined.

Chang and Eng Bunker married Adelaide and Sarah, two sisters with which surname?

The Yates sisters married the twins in a double wedding in 1843; the couples eventually kept two separate households, alternating three days at each.

According to legend, the twin founders of Rome were suckled as infants by which animal?

A she-wolf nursed Romulus and Remus in the cave called the Lupercal; Roman tradition put the city's founding at around 753 BC.

Which pair of mythological twins was placed in the sky as the constellation Gemini?

In the myth only Pollux, son of Zeus, was immortal; when mortal Castor died, Pollux asked to share his immortality and the two became stars.

Who was the famous sister of the Gemini twins of Greek myth?

Helen of Troy was Leda's daughter alongside the twins, who were known collectively as the Dioscuri, 'sons of Zeus', and served as patrons of sailors.

Gemini, the zodiac sign of the twins, is ruled by which planet?

Mercury rules Gemini, the third sign of the zodiac and an air sign; NASA borrowed the name for its two-astronaut spacecraft program in the 1960s.

In the Book of Genesis, the twin Esau sold his birthright to his brother Jacob in exchange for what?

A bowl of red lentil stew, the 'mess of pottage'; Jacob later disguised himself in Esau's clothes to claim their blind father Isaac's blessing as well.

What name was given to Elvis Presley's stillborn twin brother, delivered 35 minutes before him?

Jesse Garon's name rhymed with Elvis's own middle name, Aron; Elvis was raised as an only child in Tupelo, Mississippi, and later Memphis.

Which actor played both Kray twins in the 2015 film Legend?

Tom Hardy played Ronnie and Reggie; the Krays ran the East End 'Firm', owned the nightclub Esmeralda's Barn, and were photographed by David Bailey before being jailed for life in 1969.

Mary-Kate and Ashley Olsen got their start sharing the role of Michelle Tanner on which sitcom?

Full House ran from 1987 to 1995; despite looking alike, the Olsens are fraternal twins, and they founded the luxury fashion label The Row in 2006.

What was the 1990s sitcom starring Tia and Tamera Mowry as twins separated at birth?

Sister, Sister was cancelled by ABC after two seasons and picked up by The WB for four more; both sisters were born in Gelnhausen, West Germany.

In which sport did the Winklevoss twins compete for the US at the 2008 Beijing Olympics?

Rowing: they finished sixth in the men's coxless pair; Armie Hammer played both brothers in The Social Network, and they later founded the crypto exchange Gemini.

In which 1999 Adam Sandler comedy did twins Dylan and Cole Sprouse share the role of a five-year-old?

Big Daddy cast the Arezzo-born brothers as Julian; Cole later played Jughead Jones on Riverdale while Dylan opened a meadery in Brooklyn.

Twins James and Oliver Phelps played which prankster brothers in the Harry Potter films?

They had no acting experience and skipped school to attend an open audition in Leeds. Oliver is the elder by 13 minutes.

What is the name of Scarlett Johansson's twin brother?

Hunter Johansson, her fraternal twin, appeared with her in the 1996 film Manny & Lo and later worked in politics and nonprofits.

Which Oscar-winning actor has an identical twin brother named Sami who is four minutes younger?

Rami Malek and Sami were both in their high school drama department; only Rami went on to play Freddie Mercury in Bohemian Rhapsody.

Supermodel Gisele Bundchen's fraternal twin sister Patricia took over which job for her in 2021?

Patricia became her manager in 2021 when Gisele left IMG Models after 22 years; Gisele grew up with five sisters in Brazil.

George W. Bush's twin daughters Jenna and Barbara were born in 1981 in which Texas city?

They were born at Dallas's Baylor University Medical Center; Jenna went on to co-host the fourth hour of NBC's Today, and the twins co-wrote the memoir Sisters First.

How many big-league home runs did Jose Canseco's twin Ozzie hit?

Zero: Ozzie played just 24 MLB games without a homer, though he smashed 48 in one Atlantic League season for the Newark Bears in 2000.

Identical twins Daniel and Henrik Sedin spent their entire NHL careers with which team?

They were drafted second and third overall in 1999 and entered the Hockey Hall of Fame together in 2022; Henrik was born six minutes before Daniel.

Tiki Barber's twin Ronde won a Super Bowl as a cornerback for which team?

Both played college ball at Virginia. Ronde, seven minutes younger, was elected to the Pro Football Hall of Fame in 2023, and the pair have co-written children's books.

In the 1988 comedy Twins, what made Schwarzenegger's and DeVito's characters twins?

A secret genetic experiment produced them; the stars and director Ivan Reitman skipped their salaries for a share of the profits, and the film grossed $216 million on an $18 million budget.

Lindsay Lohan made her film debut playing both twins in the 1998 remake of which Disney film?

In The Parent Trap, twins Hallie and Annie meet at summer camp and scheme to reunite their parents; the story comes from Erich Kästner's 1949 novel Das doppelte Lottchen.

The Grady girls in The Shining were played by real identical twins with what surname?

Lisa and Louise Burns played the pair. Oddly, dialogue in the film says the sisters were 'about eight and ten,' so they weren't strictly twins in the story.

In which month is the Twins Days festival held in Twinsburg, Ohio?

The festival began in 1976 and draws thousands of twin sets each first full weekend of August. Scientists show up too, recruiting pairs for genetics studies.

Minnesota's 'Twin Cities' are Minneapolis and which neighbor to its east?

Saint Paul is the state capital while Minneapolis is the larger city, which is why the state's pro sports teams mostly use 'Minnesota' rather than either name.

Which detail about the 'Jim twins', separated at birth and reunited at 39, was actually true?

They also both owned dogs named Toy and gave their first sons nearly identical names. Their case launched the Minnesota Study of Twins Reared Apart in 1979.

Scott Kelly's identical twin, his Earth control in NASA's Twins Study, became a US senator for which state?

Mark Kelly won Arizona's 2020 special Senate election; a former astronaut married to former congresswoman Gabby Giffords, he was the control while the study tracked Scott's gene expression and telomeres.

What do the names of Kin Narita and Gin Kanie, Japan's celebrity centenarian twins, mean?

Kin means gold and Gin silver; Kin died at 107 in 2000 and Gin at 108 in 2001, after a decade of television fame that began with their 100th birthdays.

How many pairs of twins did the wife of Feodor Vassilyev, record-holder for most children, reportedly have?

Sixteen pairs of twins: her tally of 69 also included seven sets of triplets and four sets of quadruplets, and reportedly no single births at all.

What type of conjoined twins are Abby and Brittany Hensel?

Dicephalic parapagus twins share one torso with two heads; the Hensels were born in Carver County, Minnesota, while thoracopagus, joined at the chest, is the most common type.

By what percentage did the US twin birth rate rise between 1980 and 2009?

A 76 percent rise: the CDC counted 18.9 twins per 1,000 births in 1980 and 33.2 in 2009, driven by fertility treatment and women starting families later.

A specific type of which food, rich in a natural phytoestrogen, may explain the Yoruba's high twinning rate?

A local variety of yam is the suspect; its phytoestrogen is thought to stimulate the ovaries into releasing an egg from each side.

Per a 2006 study, how did vegan mothers' odds of having twins compare with omnivores'?

Vegans had about one-fifth the twinning rate; Gary Steinman pointed to insulin-like growth factor in dairy products as a possible stimulant of multiple ovulation.

Twin-to-twin transfusion syndrome can only affect twins that share what?

Sharing a placenta is the precondition: vessel connections across it let one twin pump blood to the other, and laser ablation of those vessels is the main treatment.

What was Lydia Fairchild, whom DNA tests wrongly said was not her children's mother?

She was a chimera: two of her children came from eggs derived from cells of her own absorbed twin, a condition that can also produce patchy skin colouring.

Which animal routinely gives birth to identical quadruplets from a single egg?

The nine-banded armadillo splits one fertilized egg into four genetically identical pups, a consequence of a uterus that offers just one implantation site.

The first DNA-confirmed identical twins in dogs were born by C-section in 2016 to which breed?

The Irish Wolfhound puppies shared a single placenta; vet Kurt de Cramer delivered them by C-section in South Africa and genetic tests confirmed them as identical.

Monoamniotic twins, sharing one sac, result when a single embryo divides after how long?

Splitting after the first week, around days 8 to 13, leaves one sac and one placenta; twins that split within about three days get separate placentas, like fraternal twins.

Which apostle's name, now a common boy's name, comes from the Aramaic word for 'twin'?

Thomas means 'twin', and John's gospel adds his Greek nickname Didymus, which means the same thing, so the doubting disciple is in effect called Twin twice.

Which men's tennis champion is the father of two sets of twins, girls born in 2009 and boys in 2014?

Roger Federer and his wife Mirka, a former tour player, had identical girls first and fraternal boys five years later; his sister Diana is the mother of twins too.

Which That '70s Show actor has a fraternal twin brother, Michael, who had a heart transplant as a boy?

Ashton Kutcher's twin Michael, who also has cerebral palsy, went on to become a spokesperson for a disability advocacy organization.

When identical twins have children with another identical pair, the cousins are genetically as close as what?

Full siblings is how these double cousins test, since each pair of identical parents carries the same DNA; the children of a single twin pair test as half-siblings instead.

Which bear has twins in about half of pregnancies, though the mother usually raises only the stronger cub?

Giant panda mothers are thought unable to make enough milk for two cubs because they do not store fat, so the weaker twin is left to starve.

Which Star Wars film first revealed that Luke Skywalker and Leia are twins who were separated at birth?

Return of the Jedi has Obi-Wan's spirit tell Luke that Leia is his twin sister; their birth was not shown on screen until Revenge of the Sith, 22 years later.

Fraternal twins Robin and Maurice Gibb sang with their older brother Barry in which hit-making pop group?

Bee Gees twins Robin and Maurice were born minutes apart on the Isle of Man in December 1949, with Robin arriving first.

In Greek mythology, which goddess, a daughter of Zeus and Leto, was the twin sister of Apollo?

Artemis, in one telling, was born first and at once helped her mother deliver Apollo, which fits her role as a goddess of childbirth.

Which future British prime minister became the parent of twins named Carol and Mark in 1953?

Margaret Thatcher qualified as a barrister in the same year the twins arrived, and won her seat in Parliament six years later.

Which singer's 2017 pregnancy post, ahead of twins Rumi and Sir, set a record as Instagram's most-liked image?

Beyoncé drew more than six million likes within hours for the photo, and the twins, a girl and a boy, were born that June.

In Roman legend, which god was said to have fathered the twins Romulus and Remus with Rhea Silvia?

Mars, the god of war, made an awkward father: Rhea Silvia was a Vestal Virgin, forced into a vow of celibacy so that her family line would have no heirs.

In Marvel comics, the Scarlet Witch debuted in 1964 alongside a twin brother known by which code name?

Quicksilver, the super-fast Pietro Maximoff, began beside his sister as a reluctant villain in Magneto's Brotherhood before reforming and joining the Avengers.

In Game of Thrones, which member of House Lannister is the twin brother of Queen Cersei?

Jaime, the elder son of Tywin, serves in the Kingsguard and is mocked as the Kingslayer for killing the Mad King he was sworn to guard.

Fraternal twins Phil and Lil DeVille live next door to Tommy Pickles in which Nickelodeon cartoon?

Rugrats had one actor, Kath Soucie, voice both twins and their mother too; the pair were known among the babies for their revolting habits.

Twins Dipper and Mabel Pines spend a summer with their great-uncle Stan in which Disney animated series?

Gravity Falls takes its name from the fictional Oregon town where the twins' great-uncle runs a tourist trap called the Mystery Shack.

Dylan and Cole Sprouse played which twin brothers living in Boston's Tipton Hotel on a Disney Channel sitcom?

Zack and Cody Martin lived in the hotel because their mother sang in its lounge, and the twins later took the roles to sea in the sequel The Suite Life on Deck.

Twins Brandon and Brenda Walsh are the new kids from Minneapolis in which 1990s teen drama?

Beverly Hills, 90210 built its first seasons on the Walsh twins' culture shock, with Jason Priestley and Shannen Doherty as the Midwestern newcomers.

Michael B. Jordan plays identical twins nicknamed Smoke and Stack in which 2025 Ryan Coogler horror film?

Sinners sends the twins, both World War I veterans, home to Mississippi in 1932 after seven years working for the Chicago mob, only to face a band of vampires.

On The Simpsons, chain-smoking twins Patty and Selma are the older sisters of which character?

Marge Simpson and her twin sisters share a voice as well as a family: Julie Kavner plays all three, and the twins both work at the Springfield DMV.

Which half-cousin of Charles Darwin pioneered the use of twins to weigh nature against nurture?

Francis Galton surveyed twins by questionnaire and published 'The History of Twins' in 1875, and he popularised the phrase 'nature versus nurture'.

Which field of biology studies the chemical tags on DNA that make identical twins grow less alike with age?

Epigenetics found that young identical twins carry near-matching chemical marks, while older pairs, above all those who lived apart, differ markedly.

Which small South American monkeys usually give birth to fraternal twins that the father carries on his back?

Marmosets get unusual help from the father, who assists at the birth, cleans up afterwards and even bites through the umbilical cords.

What is the farming term for a female calf left infertile by sharing the womb with a male twin?

Freemartin calves start out genetically female but take up hormones and cells from their brother through shared blood vessels, which masculinizes them before birth.

Kodinhi, a village known worldwide for its unusually large number of twins, lies in which Indian state?

Kerala's Kodinhi stands out all the more because India has one of the lowest twinning rates in the world; the village founded the country's first twins association.

In the Book of Genesis, which wife of Isaac gave birth to the twins Jacob and Esau?

Rebecca felt the twins struggling inside her and was told that two nations were in her womb, and that the older would serve the younger.

In Hindu tradition, the twin brothers Lava and Kusha are the sons of the goddess Sita and which prince?

Rama's sons are said to have been the first to hear the Ramayana, recited by its composer Valmiki, and then to have spread the epic by travelling and performing it.

The exploits of the Hero Twins Hunahpu and Xbalanque fill part of which sacred text of the K'iche' Maya?

Popol Vuh also holds the Maya creation story, and its tale of the twins is the oldest Maya myth to have survived in full.

The twins Alexander Helios and Cleopatra Selene were the children of Cleopatra and which Roman leader?

Mark Antony's twins were named for the sun and the moon, the meanings of Helios and Selene in Greek, and were taken to Rome after their parents' defeat.

William Shakespeare and Anne Hathaway had twins, baptised in 1585, named Judith and what?

Hamnet died at eleven, a few years before his father wrote Hamlet; the twins were probably named after a Stratford baker and his wife, Hamnet and Judith Sadler.

Which Shakespeare play, set in Ephesus, follows two sets of identical twins who were separated at birth?

The Comedy of Errors doubles the confusion by giving twin masters, both named Antipholus, a pair of twin servants who are both named Dromio.

In Alexandre Dumas's fiction, the Man in the Iron Mask is the secret identical twin of which French king?

Louis XIV has a twin named Philippe in the novel, concealed and imprisoned from birth by his own parents, Louis XIII and Anne of Austria.

Twin boys Sam and Eric are among the few who stay loyal to Ralph in which classic island novel?

Lord of the Flies has the twins mistake a dead body for the feared beast, a blunder that spreads panic among William Golding's stranded schoolboys.

Fraternal twins Estha and Rahel are at the centre of which Booker Prize-winning novel set in India?

The God of Small Things, Arundhati Roy's debut, cuts between 1969, when the twins are seven, and 1993, when they meet again as adults.

Which actor played both Winklevoss twins in the 2010 Facebook drama The Social Network?

Armie Hammer filmed his scenes beside a body double, Josh Pence, onto whose body his own likeness was then digitally imposed.

Nicolas Cage played twin screenwriters Charlie and Donald Kaufman in which Oscar-nominated 2002 film?

Adaptation lists the invented twin Donald as a co-writer in its own credits, beside the real Charlie Kaufman, who wrote himself into the script.

Which actor plays both twin gynecologists in David Cronenberg's 1988 thriller Dead Ringers?

Jeremy Irons played both Mantle brothers in a story drawn from the lives of the real Marcus twins, by way of a novel about them that was itself titled Twins.

Scottish twins Craig and Charlie Reid, famous for a 1988 hit about walking 500 miles, perform as which act?

The Proclaimers are identical twins born in Leith in 1962, and the song gave them number ones in Australia, Iceland and New Zealand.

Which Canadian singer-songwriter has a twin brother, Wade, a musician who is twelve minutes older?

Alanis Morissette's twin Wade also went into music, while her 1995 album Jagged Little Pill became one of the best-selling of all time.

The twin paradox, where a space traveller comes home younger than a twin left behind, tests whose theory?

Albert Einstein's special relativity makes a fast-moving clock run slow, so the travelling twin really does age less, a result physicists have been explaining since 1911.

People magazine reportedly paid $6 million in 2008 for the first photos of which singer's newborn twins?

Jennifer Lopez had toured while pregnant, and the fee made the pictures the most expensive celebrity photos ever taken up to that point.

Identical twins Jessica and Elizabeth Wakefield are the heroines of which teen book series set in California?

Sweet Valley High was turned out by a team of ghostwriters under Francine Pascal, with the twins living in a fictional suburb near Los Angeles.

Which Canadian actor, the son of two actors, has a twin sister, Rachel, who works in film post-production?

Kiefer Sutherland's twin Rachel stayed behind the camera as a post-production supervisor, while he followed his parents, Donald Sutherland and Shirley Douglas, on screen.

Identical twins Lech and Jaroslaw Kaczynski served together as president and prime minister of which country?

Poland's ruling twins had been child stars first, playing the leads together in the 1962 film The Two Who Stole the Moon.

British twins Norris and Ross McWhirter founded and edited which annual reference work from 1955?

Guinness Book of Records work came the twins' way after the brewery's directors enjoyed quizzing them on records and unusual facts at an interview.

Conjoined twins Chang and Eng Bunker quit touring and made their home near Mount Airy in which state?

North Carolina turned the twins into American citizens and family men: they married local sisters and fathered 21 children between them.

Twins Phil and Steve Mahre finished first and second in the same 1984 Winter Olympic race in which sport?

Alpine skiing's slalom title went to Phil only after Steve, skiing last with victory in reach, made a series of mistakes and dropped to second.

Identical twins Bill and Tom Kaulitz began performing at age ten and went on to front which German rock band?

Tokio Hotel grew out of the twins' childhood act near Magdeburg, and its 2005 album Schrei sold more than half a million copies.

In Greek myth, Iphicles was the mortal twin of which hero, whose own father was Zeus?

Heracles and Iphicles shared a mother, Alcmene, but not a father: Iphicles was the son of her husband Amphitryon, whose shape Zeus had borrowed.

In Greek mythology, Thanatos, the personification of death, has a twin brother, Hypnos, who personifies what?

Sleep and death as twin brothers goes back to Homer's Iliad, where the pair carry a fallen hero home, and Hypnos is the origin of the word hypnosis.

Twin brothers Joel and Benji Madden formed which rock band in Waldorf, Maryland, in the 1990s?

Good Charlotte borrowed its name from a children's book about the girls of an orphanage, written by Carol Beach York.