25 Delicious Facts About Lobsters

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ThinkStock

We cracked open America's favorite crustacean, Homarus americanus, to plate the delicious facts hiding inside. Bob Bayer, head of the University of Maine’s Lobster Institute, helps us out.

1. If you cut a lobster, does it not bleed? Yes, of course—but it doesn't look like you'd expect. Lobster blood is colorless until exposed to oxygen, at which point it turns blue.

2. Typically, lobsters are a mottled brown, but genetic mutations can create red, blue, calico, and even albino lobsters. Heat denatures the proteins in the lobsters’ shells, releasing astaxanthin, which turns their shells bright red when they’re cooked.

3. Every time they molt—splitting their shells along the seam in the carapace—lobsters increase 20 percent in size. Young lobsters molt several times a year, but after they hit one pound, they start molting annually. After finding a soft place to hide, “they shed every part of the hard material, including the lining of the intestine,” Bayer says. "When the lobster comes out of its old shell, it’s all wrinkly. Its new shell is softer than your skin. If you take that lobster out of water, the claws will fall off; it doesn’t have the mechanical strength to keep the claws on." Then they eat their old shells for the calcium and phosphorus.

4. Freshly molted lobsters are called shedders.

5. The warmer the water, the faster lobsters grow.

6. Lobsters have three pairs of antennae, the largest of which is used for tactile sensing. "If a lobster’s going to go into a hole, for example, it’ll wave those large antennae around, sort of feel the hole, and then determine if it can fit, and then it’ll back in and hide," Bayer says. The two smaller pairs are chemosensory, helping the lobster find its food by sensing dissolved substances in the water, "a combination of our sense of taste and smell in one function,” according to Bayer.

7. The bigger claw is called the crusher claw, and lobsters use it to break up clams, crabs, and sea urchins. The cutter claw is used for tearing. “Some good-sized lobsters can raise a pressure closing strength of 100 pounds per square inch,” Bayer says. “Most of them are less than that, but it’s still a good amount of pressure.” If a lobster loses one of its claws or walking legs, the limb will regenerate. "If you’ve got a wound around the time that lobster is molting, you sort of get mixed biochemical signals, so you might end up with a duplicate of something," Bayer says. "You might get, say, two thumbs sticking out of the same claw."

8. Lobsters walk forward, but if they need to quickly get away, they propel themselves backward by pumping their tails. Females have broader tails than males so they can hold eggs there.

9. These crustaceans can’t see clear images, but their compound eyes are sensitive to light. Severing the eyestalk—which also serves as the lobster's hormonal center—will cause it to molt. And eyes don't grow back.

10. Lobsters use the front two legs—which are studded with chemosensory hairs—to put food into their mouths. “It almost looks like a squirrel eating,” Bayer says. The food goes into the stomach, where the gastric mill—made up of three teeth-like structures—grinds it up. Next, the food travels through the tomalley—a.k.a. the green thing you scrape off your meat. It’s the lobster’s main digestive tract: a small intestine, pancreas, and liver in one—and it’s a delicacy!

11. Lobsters aren’t scavengers; in fact, they feed on a large variety of live things, including other lobsters, marine worms, clams, mussels, and crabs in addition to bait (which is most often salted herring).

12. It takes a lot of herring to catch a lobster: "It averages about a pound of herring per pound of lobster that’s caught," Bayer says. "It’s expensive. It may be more than we need. We actually had a student who looked at this, and she found that you could use less and catch the same amount of lobster. But old habits die hard."

13. Fin-like structures called swimmerets help lobsters circulate water inside their shelters; females also use them to carry eggs.

14. Lobsters pee out of their faces. The urine comes from antennal glands located near the antennae. "They're greenish brown spots," Bayer says. "They actually look like two pieces of snot—that’s the best way to describe them. You'd have to open them up to see them." Peeing at each other is part of both fighting and courtship.

15. Speaking of courtship: In lobsters, it's kind of complicated. To woo a dominant male—who will have previously spent his time beating up her and all of the other lobsters in his neighborhood—the female heads to his shelter a number of times and pees pheromone-laced urine into it, which helps him relax. Because lobsters are cannibals, the pheromone is telling him two things: “It’s time to breed" and "Don’t eat me!” 

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Eventually, when he is sufficiently wooed, she'll move into his shelter and molt, at which point he uses the first pair of swimmerets—which, in males, are hard and bone-like and called gonopods—to transfer sperm to her. She'll stay in his shelter for another 10 days or so while her new shell hardens. Then she's back to her own life, and it's time for a new female to woo the male.

16. She stores the semen in a receptacle between her walking legs for six to nine months before she extrudes eggs, which then sit on her tail for another six to nine months. "When they’re immature, they’re very dark," Bayer says. "As they’re getting ready to hatch, these larvae, you can see the eyes." 

17. A lobster that's a pound and a half might carry 8000 to 10,000 eggs, which are kept in place by glue created in her cement glands. "The bigger they are, the more eggs they have," Bayer says. "You might have 30,000 or 40,000 on a really big lobster." If you’re eating lobster and find bright red stuff, that’s unextruded eggs—also known as roe.

18. When a fisherman traps a female lobster carrying eggs, he puts a V-notch in her tail. This tells other fishermen that she's a breeding female whether she has eggs or not, and should be thrown back. "They’re protected as long as that notch is present," Bayer says. "You're protecting your breeding population. If you think about it, it’s sensible, because you’re going to have your classes that don’t settle well, that don’t have good survival, but you’ve got this huge root stock that’s out there, so that the next year it can come back."

19. "When lobsters first hatch, they float—they float for the first couple of weeks," Bayer says. Some scientists call those floaters superlobsters, because they can swim forward in the water with their claws outstretched by beating the swimmerets under their tails. After this phase, they settle on the bottom. "Those that settle to the bottom, many of them will survive," Bayer says, "and it’s a good measure of what the upcoming stock is."

20. By the way: Despite what Phoebe from Friends believed, lobsters aren't monogamous. "Sometimes they'll have multiple parentage," Bayer says.

21. Fishermen used to guess at a lobster's age based on its size. Scientists only recently discovered an accurate way to determine a lobster's age: dissecting it and counting the rings in the eyestalk and gastric mill—similar to the way we calculate a tree's age.

22. The largest lobster ever recorded was caught near Nova Scotia in 1977 and weighed 44 pounds!

23. Science has shown that lobsters can recognize each other. Researchers at Woods Hole Oceanographic Institution set up an experiment where two crustaceans fought each other in a ring. Later, when they tried to have those same two lobsters fight again, the one that lost the first time recognized the winner and backed down immediately. "It wasn't just that the loser lobster had become a sissy or something," Trevor Corson, author of The Secret Life of Lobsters, told National Geographic. "When matched with a new lobster, he fought ferociously. So he was recognizing that previous lobster. They blindfolded him, and it didn't make a difference. So we get back to this pissing-in-each-other's-faces thing. [The scientists] catheterized a lobster with little tubes attached to its face and collected urine during combat. It turned out that without the urine in the water, the lobsters couldn't recognize each other." The losing lobster would recognize the winner for up to a week.

24. Can lobsters and other crustaceans feel pain? Scientists have gone back and forth on this; some recent research suggests that they probably do, while another study, published in 2005, says they don't. "There can be no absolute answer," Bayer says, though he's in the "no pain" camp. "They sense their environment, but don’t have the intellectual hardware to process pain. [If you look at] the nervous system of a lobster next to a grasshopper, and what’s notable is that the nervous system is so primitive that there isn’t really much to it. We argue that there is no brain and no ability to process pain. They do respond to their environment, and they sense that it’s not right for them. If they sense warmth or even chemicals in their environment, they’ll try to avoid them, those things that are noxious." Some suggest that the most humane way to cook a lobster is to start by putting it in fresh cold water or the freezer—both of which essentially puts it to sleep—before dropping it in the pot. (The "scream," by the way, isn't a scream at all, but steam escaping from their shells.)

25. According to Bayer, "Anything that kills insects can kill a lobster," and lobsters are extremely sensitive to insecticides, even at parts-per-billion concentration: "They’re so sensitive that, if you’ve got a room with a lobster tank, and you take an insecticide and you give it a five-second spray at the end of the room, it's likely that all those lobsters would be dead by the end of the day," he says. So we might want to think about what we're dumping into our oceans.


Looking to Downsize? You Can Buy a 5-Room DIY Cabin on Amazon for Less Than $33,000

Five rooms of one's own.
Five rooms of one's own.
Allwood/Amazon

If you’ve already mastered DIY houses for birds and dogs, maybe it’s time you built one for yourself.

As Simplemost reports, there are a number of house kits that you can order on Amazon, and the Allwood Avalon Cabin Kit is one of the quaintest—and, at $32,990, most affordable—options. The 540-square-foot structure has enough space for a kitchen, a bathroom, a bedroom, and a sitting room—and there’s an additional 218-square-foot loft with the potential to be the coziest reading nook of all time.

You can opt for three larger rooms if you're willing to skip the kitchen and bathroom.Allwood/Amazon

The construction process might not be a great idea for someone who’s never picked up a hammer, but you don’t need an architectural degree to tackle it. Step-by-step instructions and all materials are included, so it’s a little like a high-level IKEA project. According to the Amazon listing, it takes two adults about a week to complete. Since the Nordic wood walls are reinforced with steel rods, the house can withstand winds up to 120 mph, and you can pay an extra $1000 to upgrade from double-glass windows and doors to triple-glass for added fortification.

Sadly, the cool ceiling lamp is not included.Allwood/Amazon

Though everything you need for the shell of the house comes in the kit, you will need to purchase whatever goes inside it: toilet, shower, sink, stove, insulation, and all other furnishings. You can also customize the blueprint to fit your own plans for the space; maybe, for example, you’re going to use the house as a small event venue, and you’d rather have two or three large, airy rooms and no kitchen or bedroom.

Intrigued? Find out more here.

[h/t Simplemost]

This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links.

9 Unsung Heroes of the Underground Railroad

An illustration depicting fugitives along the Underground Railroad in Maryland, taken from William Still's 1872 book The Underground Railroad.
An illustration depicting fugitives along the Underground Railroad in Maryland, taken from William Still's 1872 book The Underground Railroad.
Philadelphia, Porter & Coates, Library of Congress Prints and Photographs Division // No Known Restrictions on Publication

Considering that the massive network of hidden paths and safe houses known as the Underground Railroad stretched from the Deep South all the way to Canada, it makes sense that hundreds of people were involved in its operation. Some, like Harriet Tubman, were “conductors,” who led the rescue missions, while others—John Brown, for example—were “station masters,” hosting fugitives in their homes and arranging safe passage to freedom. Here are nine other valorous heroes who risked life and limb to help people on their way to liberty.

1. William Still

A sketch of William Still from Wilbur Henry Siebert and Albert Bushnell Hart's 1898 book The Underground Railroad From Slavery to Freedom.Macmillan, Wikimedia Commons // Public Domain

Born to formerly enslaved parents in New Jersey in 1821, William Still moved to Philadelphia at age 23 and took up the abolitionist mantle in more ways than one. He taught himself to read and write, got a job as a clerk for the Pennsylvania Abolition Society, and advanced through the organization until he was named chairman of its new Vigilance Committee in the early 1850s. In that position, Still oversaw the region’s network of safe houses—his own house among them—and raised money to finance key rescue missions, including a few of Harriet Tubman’s.

It’s estimated that Still ferried about 800 people to freedom during his tenure; one of them was his brother Peter. But there’s another reason he’s often referred to as “the Father of the Underground Railroad.” Still documented the stories of more than 600 escapees and published them all in a groundbreaking volume called The Underground Railroad in 1872, making him the only Black person ever to write and self-publish a firsthand account of activity on the Underground Railroad. He hoped that the “extraordinary determination and endeavor” exhibited in the harrowing narratives would inspire Black Americans to continue the struggle for civil rights.

“The race must not forget the rock from whence they were hewn, nor the pit from whence they were digged,” he wrote in the introduction. “Like other races, this newly emancipated people will need all the knowledge of their past condition which they can get.”

2. John P. Parker

Parker's house in Ripley, Ohio.Nyttend, Wikimedia Commons // Public Domain

When John P. Parker was 8 years old, a merchant separated him from his enslaved mother in Norfolk, Virginia, and sold him to a doctor in Mobile, Alabama. There, Parker apprenticed at an iron foundry—and learned to read and write, with the help of the doctor’s children. At age 18, he persuaded one of the doctor’s patients to purchase him and let him gradually buy back his freedom with his foundry earnings. The plan worked, and Parker left for Ripley, Ohio, where he built a house, started a family, and patented a few popular mechanical parts for tobacco machines during a successful career as a foundryman.

Through it all, Parker made regular excursions across the Ohio River to spirit fugitives from Kentucky back to Ripley’s safe houses (one belonged to John Rankin, a prominent white abolitionist who lived less than a mile from Parker). Parker’s rescue missions were especially dangerous, partially because bounty hunters looking for fugitives knew who he was, and partially because Parker himself was dauntless. Once, an enslaver suspected a married couple would attempt to escape, so he took their baby and put him to sleep in his room. Parker snuck into the room, carefully plucked the child from the bed—where the enslaver also lay sleeping—and dashed back through the house. The enslaver awoke and tore after him, firing his pistol, but Parker and the family managed to escape across the river.

Parker recounted these rescues to journalist Frank M. Gregg during a series of interviews in the 1880s, but the manuscript sat forgotten in Duke University’s archives until historian Stuart Seeley Sprague unearthed it and published it in 1996.

3. and 4. Harriet Bell Hayden and Lewis Hayden

A portrait of Lewis Hayden from William Lloyd Garrison's abolitionist newspaper The Liberator.The Liberator, Wikimedia Commons // Public Domain

Born enslaved in Lexington, Kentucky, in 1812, Lewis Hayden watched enslavers tear apart his family not once, but twice. First, his siblings were sold to a different enslaver; and later, his wife and son were bought by Kentucky senator Henry Clay [PDF] and sold somewhere in the Deep South. Hayden never saw them again. In the early 1840s, he married an enslaved woman named Harriet Bell, adopted her son, and soon began plotting their escape.

With the help of Calvin Fairbank, a minister, and Delia Webster, a teacher, the Haydens fled their enslaver’s estate and eventually arrived safely in Canada. By 1846, they had returned to the U.S. and settled in Boston’s Beacon Hill neighborhood, where they opened a clothing store. Before long, Lewis and Harriet had joined the Boston Vigilance Committee and turned their home into a boarding house, which became a highly trafficked stop on the Underground Railroad.

A drawing of Harriet Bell Hayden from her obituary in The Cleveland Gazette.The Cleveland Gazette, Wikimedia Commons // Public Domain

Though slavery had been illegal in Massachusetts since 1783, the Fugitive Slave Act of 1850 stated that enslaved people who had escaped to free states could still be found and returned to their enslavers in the South. The Haydens fearlessly protected hundreds of people from bounty hunters who tried to do just that. Ellen and William Craft, for example, had garnered widespread attention for their risky escape from slavery in Georgia, which involved Ellen impersonating a white man and William posing as her Black servant. When bounty hunters pursued them to the Haydens’ house, Lewis announced that he’d readily blow up the whole property with the two kegs of gunpowder he kept inside if they tried to kidnap the Crafts. The bounty hunters didn’t chance it, and left empty-handed.

Lewis also helped recruit Black soldiers for the 54th Massachusetts Infantry—one of the Union’s first all-Black military units—and was even elected to the Massachusetts General Assembly in 1873. When he died in 1889, Boston’s city council praised him as “one of the pioneers in the freeing of this country from the curse of slavery.” Harriet, who died in 1893, donated her entire estate to Harvard Medical School for the purpose of establishing a scholarship for Black students, which still exists today.

5. Henrietta Bowers Duterte

A photo of Henrietta Bowers Duterte with one of her children.Unknown Author, Wikimedia Commons // Public Domain

In 1852, Henrietta Bowers, a 35-year-old tailor, married a Haitian-American undertaker named Francis A. Duterte. They both came from well-respected Philadelphia families, and Francis’s mortuary was successful; in other words, it should have been a long, happy union. But by the end of that decade, Henrietta was alone: Her children had all died young, and Francis had also passed away suddenly. Instead of handing the mortuary business over to a man—which would have been expected at the time—Henrietta took it over and, in addition to running the mortuary, turned it into an especially clandestine stop on the Underground Railroad.

Not only did Henrietta use funeral processions as opportunities to help disguised fugitives slip unnoticed through the city, but she also sometimes smuggled them out of Philadelphia in actual coffins. The mortuary continued to be lucrative, and Henrietta funneled the profits into organizations that served Philadelphia’s Black community, like the First Colored Church and Stephen Smith’s Philadelphia Home for Aged and Infirm Colored Persons. In 1866, she helped arrange the Freedman’s Aid Society Fair to support formerly enslaved people in Tennessee.

6. David Ruggles

A political cartoon depicting a slave owner raging against Ruggles and two other abolitionists who had helped one of his servants escape.Edward Williams Clay, Library of Congress Prints and Photographs Division // No Known Restrictions on Publication

David Ruggles, born free in Norwich, Connecticut, in 1810, moved to New York City at age 17 and opened a grocery shop, which he staffed with emancipated Black Americans. Before long, Ruggles pivoted to lending and selling abolitionist books, pamphlets, and newspapers, too, making him the nation’s first Black bookstore owner. In 1835, Ruggles and other local abolitionists founded the New York Vigilance Committee, an interracial organization which, like the one in Philadelphia, helped people escape from slavery. Not only did he provide legal aid to Black Americans targeted by bounty hunters, but he also housed many fugitives in his own home on Lispenard Street.

One of these temporary guests was Frederick Douglass, who escaped from slavery and arrived in New York penniless and famished in 1838. He was rescued, he explained in his 1845 autobiography, “by the humane hand of Mr. David Ruggles, whose vigilance, kindness, and perseverance, I shall never forget.” Douglass wrote to his fiancée, Anna, who joined him within a few days, and Ruggles even arranged a marriage ceremony in the house. Soon after the wedding, Ruggles gave the couple $5 and booked their passage on a steamship to New Bedford, Massachusetts.

Throughout his years as an Underground Railroad station master, Ruggles distributed countless anti-slavery publications and advocated for “practical abolitionism,” or the idea that each person should actively take part in emancipating Black Americans. He wasn’t without enemies: twice his shop was burned down, and he was physically attacked on several occasions. By his late twenties, Ruggles’s health was failing, and abolitionist Lydia Maria Child encouraged him to come live with the Northampton Association of Education and Industry, a self-sufficient community in Florence, Massachusetts, that championed equal rights for all. There, Ruggles regained some of his strength through hydrotherapy, and he eventually opened his own hydrotherapy hospital, where Douglass often visited him. When he died at age 39, it was Douglass who wrote his obituary.

7. and 8. Harriet Forten Purvis and Robert Purvis

A daguerroeotype of Robert Purvis from the 1840s.Boston Public Library, Flickr // CC BY 2.0

Robert Purvis, the son of a white man and a free Black woman, was active in practically all facets of Philadelphia’s anti-slavery movement from the 1830s through the Civil War. He helped found and lead the Vigilant Association of Philadelphia and its Vigilance Committee, which offered boarding, clothing, medical attention, legal counsel, and northern passage to fugitives; and he also worked alongside prominent abolitionists like William Lloyd Garrison to establish the American Anti-Slavery Society in 1833 and the Pennsylvania Anti-Slavery Society a few years later.

Since women weren’t originally allowed to be members of the American Anti-Slavery Society, Robert’s wife, Harriet Forten Purvis, joined Lucretia Mott and other activists in forming the Philadelphia Female Anti-Slavery Society in December 1833. Harriet, like Mott, would go on to become a leader in the suffrage movement, too.

Robert and Harriet had both come from extremely successful and respected Philadelphia families, and they used their influence—and financial resources—to assist escapees in any way they could. Their house on Lombard Street became a well-traversed thoroughfare for fugitives heading north.

“He was President of the ‘Underground Railroad,’ and throughout that long period of peril his house was a well-known station where his horses and carriages and his personal attendance were ever at the service of the travelers upon that road,” read Robert's 1898 obituary in The New York Times.

A portrait of Harriet Forten Purvis circa 1874. ExplorePAhistory.com // Public Domain

The couple’s high-profile work sometimes made them a target for those who opposed the upward mobility of Black Americans. In August 1842, a parade celebrating the eighth anniversary of the end of slavery in the British West Indies devolved into violence when an Irish mob—resenting their own low position in society—attacked the revelers and began looting and setting fire to Black-owned buildings along the street. The rioters planned to progress to the Purvises' house, where Robert stood armed and waiting, but a Catholic priest reportedly diverted them.

After that, Robert and Harriet moved their family to a farmhouse in Byberry, a northeastern neighborhood of Philadelphia, and promptly turned their new estate into another station on the Underground Railroad. Robert approximated that between 1831 and 1861, he had helped emancipate about one person per day (though it’s possible that this calculation included his broader work with various anti-slavery organizations).

9. Samuel D. Burris

A sketch of Samuel D. Burris from William Still's book The Underground Railroad.Delaware Historical & Cultural Affairs, Wikimedia Commons // Public Domain

Samuel D. Burris worked tirelessly during the 1840s to lead fugitives through his home state of Delaware and into Philadelphia, where he lived with his wife and children. Though Burris was a free man, he could be imprisoned and sold into slavery if caught helping fugitives in Delaware—and in 1847, he was.

Officials apprehended Burris when he was trying to smuggle a woman named Maria Matthews onto a steamship. Since they set his bail at $5000 (more than $157,000 today), he was forced to spend months in jail while awaiting trial. “They uphold and applaud those slave traffickers, and those inhuman and unmerciful leeches, in their soul-damning conduct, by making the colored people legal subjects for their bloody principles to feast on,” he wrote from his cell, in a letter that was later published in William Lloyd Garrison’s abolitionist newspaper The Liberator.

On November 2, 1847, Burris was convicted, fined $500, and sentenced to 10 more months in prison. After that, he’d be sold into slavery for 14 years. While Burris was serving his 10-month sentence, a group of Philadelphia abolitionists amassed $500 and sent a Quaker named Isaac Flint to pose as a trader and purchase Burris at the auction. Luckily, Flint ended up being the highest bidder (though according to William Still’s account in The Underground Railroad, luck had little to do with it: Flint savvily bought off a Baltimore trader who had tried to top his bid).

“[Burris] was not by any means aware of the fact that he had fallen into the hands of friends, but, on the contrary, evidently labored under the impression that his freedom was gone,” Still wrote. “The joyful news was whispered in the ear of Burris that all was right; that he had been bought with abolition gold to save him from going south.”

As Delaware State University historian Robin Krawitz told CNN, Burris continued helping fugitives after his release, and angry Delawarians actually petitioned the government to discipline him more severely. After officials enacted legislation that recommended public whipping as punishment for anyone caught a second time, Burris halted his operations in Delaware. Instead, he moved to San Francisco, where he raised funds to help newly freed people establish themselves.