What Happens If You Eat a Daddy Long Legs?

Swallowing a daddy long legs, whether on purpose or by accident, is harmless. These tiny arachnids contain no venom dangerous to humans, no significant toxins, and are small enough that your digestive system handles them the way it handles any incidental bit of protein. The bigger story here involves a persistent myth about their supposed deadliness, a case of mistaken identity between three completely different creatures, and some genuinely interesting chemistry that still poses zero risk at the dinner table.

Which Creature Are We Talking About

“Daddy long legs” is one of those common names that causes endless confusion because it refers to at least three unrelated animals depending on where you live. In much of the United States and the United Kingdom, the name most often points to harvestmen, which belong to the order Opiliones. These are arachnids with a single fused body segment and extraordinarily long, spindly legs. They have no venom glands and no silk glands, so they cannot bite in any meaningful way and do not build webs.¹ In parts of the southern U.S. and across much of the world, the name also gets applied to pholcid spiders, the wispy, web-building spiders you find in ceiling corners. And in the U.K. and Australia, crane flies, which are flying insects and not arachnids at all, also go by the name.

This matters because the answer to “what happens if you eat one” depends slightly on which creature ended up in your mouth. For all three, the practical answer is the same: nothing bad. But the biology behind that safety differs, and the famous myth about deadly venom only applies to one of them.

The Myth About Deadly Venom

You have almost certainly heard the claim that daddy long legs are “the most venomous spiders in the world” but their fangs are too small to pierce human skin. This is wrong on every level, and which version of wrong you get depends on which creature you’re discussing.

Harvestmen, the most common bearers of the name, have no venom at all. They are not spiders. They lack venom glands entirely, so the question of fang size is irrelevant. They could crawl across your tongue and the only thing you’d notice is the tickle of those long legs.

Pholcid spiders do produce venom and can technically bite humans. But research on pholcid venom has shown the effects are trivial. A study on the pholcid species Physocyclus mexicanus analyzed its venom composition and tested its potency. Documented bites on humans produced nothing more than a mild, short-lived sting with no lasting effects.² The venom contains some interesting peptides from a biochemical standpoint, but its effects on mammals are inconsequential. So even if a pholcid spider somehow managed to bite the inside of your mouth on the way down, you would barely feel it.

Crane flies have no venom whatsoever and do not bite. They are flies. Eating one is about as consequential as accidentally inhaling a gnat.

What Your Stomach Actually Does With It

When you swallow a daddy long legs, your stomach acid and digestive enzymes go to work on it the same way they break down any small piece of animal matter. The exoskeleton of arachnids is made of chitin, a tough structural carbohydrate. Humans do produce some chitinase enzymes that can partially break down chitin, though we are not especially efficient at it. The small amount of chitin in a single daddy long legs is negligible, and whatever your body cannot digest passes through without incident.

The protein, fat, and other soft tissue gets broken down normally. Interestingly, some spider-derived peptides are remarkably resistant to digestive enzymes. Lab tests have shown that certain spider venom peptides with a particular molecular structure survived exposure to pepsin, trypsin, and other proteases under conditions mimicking the human gut.³ That sounds alarming until you remember two things: harvestmen have no venom peptides in the first place, pholcid spider venom is harmless to mammals even when injected directly, and any venom present in a swallowed spider is in vanishingly small quantities. Even if some peptide fragments survived digestion intact, the amount is far too small to cause any physiological effect. Your gut lining is a barrier that intact peptides generally cannot cross into the bloodstream anyway.

The Chemical Defenses of Harvestmen

Harvestmen may not have venom, but they are not entirely defenseless. Many species produce chemical secretions from scent glands located near the base of their legs. If you’ve ever picked up a harvestman and noticed an odd, sharp smell, that is their defense mechanism at work.

The chemistry behind these secretions is surprisingly complex. Researchers have identified benzoquinones as the primary defensive compounds in many harvestman species. One study of a European harvestman found its secretion contained mainly 1,4-benzoquinone along with 1,4-naphthoquinone and octanoic acid.⁴ A broader survey of harvestman species found at least nine different quinone compounds across the group, including various naphthoquinones and anthraquinones.⁵ These compounds are effective at deterring predators, and tests have confirmed that the benzoquinone secretions of at least one neotropical species successfully repel both invertebrate and vertebrate predators.⁶

Benzoquinones are irritating compounds. In concentrated form, they can cause skin irritation, and 1,4-benzoquinone is used industrially as a chemical intermediate. But the amount a single harvestman produces is tiny, measured in micrograms. If you ate a harvestman and it released its full defensive payload, you might notice a faintly unpleasant, acrid taste. You would not experience any toxic effects. The dose is simply too small. Your saliva would dilute it, your stomach acid would break it down further, and you’d be left with nothing more than a bad memory and possibly a slight peppery aftertaste.

Could You Have an Allergic Reaction

This is the one area where eating a daddy long legs could, in rare circumstances, cause a problem for a specific person. Arachnids share certain proteins with other invertebrates, and one protein family in particular, tropomyosin, is a well-documented allergen that shows up across a wide range of invertebrate species. Allergenic tropomyosins have been identified in crustaceans like shrimp and crab, arachnids including house dust mites, insects like cockroaches, and mollusks such as squid.⁷

The cross-reactivity between these groups is well established. If you have a known shellfish allergy, your immune system might recognize the tropomyosin in an arachnid as similar enough to mount a response. In practical terms, the amount of tropomyosin in a single daddy long legs is extremely small, so even for someone with severe shellfish allergy, swallowing one is unlikely to trigger a full allergic reaction. But “unlikely” is not “impossible,” and anyone with a documented allergy to shrimp, dust mites, or cockroaches has at least a theoretical vulnerability to cross-reactive proteins in arachnids. If you have such allergies and accidentally swallow a daddy long legs, there is no reason to panic, but it is worth being aware that the protein overlap exists.

Bacteria and What Daddy Long Legs Carry

Any wild animal carries some microbial passengers, and daddy long legs are no exception. Spiders and other arachnids harbor bacteria on their exoskeletons and in their gut that reflect the environments they live in. Research on spider-associated bacteria has found a range of species including Bacillus, Staphylococcus, E. coli, and Klebsiella pneumoniae, with the specific bacterial community depending heavily on where the spider was collected.⁸ Spiders from agricultural settings carried different microbial profiles than those from buildings or natural habitats.

For a single daddy long legs swallowed whole, the microbial load is negligible. Your stomach acid kills the vast majority of bacteria on contact, and the total bacterial population on a creature that weighs a fraction of a gram is not meaningfully different from what you encounter touching a doorknob and then eating a sandwich. This is not like eating raw chicken, where the bacterial load is concentrated in a food-sized portion. It is more like getting a speck of dirt in your mouth. Healthy stomach acid handles it without difficulty.

That said, people with compromised immune systems have less margin for error with any unexpected microbial exposure. For someone undergoing chemotherapy or taking immunosuppressive medications, even small bacterial introductions that a healthy person shrugs off could theoretically pose a risk. This is a general caution that applies to all incidental ingestion of non-food items, not something specific to daddy long legs.

Heavy Metals and Environmental Contamination

One less obvious angle involves what daddy long legs might have accumulated from their environment. Arachnids, including both spiders and harvestmen, sit in a food web position where they can concentrate metals from the soil and from the smaller invertebrates they eat. Research has shown that metals transfer up the food chain and accumulate in spider bodies through biomagnification.⁹ Studies near contaminated sites have found that spiders reflect the contamination level of their surroundings, with metal concentrations decreasing as distance from the pollution source increases.¹⁰ In fact, researchers use spiders as biological monitors of pollution precisely because they accumulate metals so reliably.

Cadmium, lead, zinc, silver, and mercury have all been measured in spider tissues at elevated levels near industrial and mining sites.¹¹ For eating a single daddy long legs from your house or garden, this is a non-issue. The total body mass of a harvestman is so small that even if it contained elevated metal concentrations, the absolute amount of metal you’d ingest would be vanishingly tiny compared to what you encounter from normal dietary sources, tap water, or ambient air. But the science here is genuinely interesting because it points to a broader truth about how pollutants move through ecosystems. If you were, hypothetically, eating daddy long legs by the handful from an area near a smelter or a mine, the cumulative metal exposure could add up. This is not a realistic scenario for anyone, but it is worth understanding that all small creatures carry a chemical signature of their habitat.

Spiders as Food Around the World

Eating arachnids is not nearly as unusual globally as it might seem from a Western perspective. Various spider species are consumed as food in parts of Southeast Asia, Central America, and sub-Saharan Africa. The practice is a form of entomophagy, which broadly refers to eating arthropods. Research into the nutritional content of edible spiders has found that some species are remarkably protein-dense. Certain orb-weaver spiders, for instance, have been measured at protein levels ranging from about 34% to over 73% of their dry weight, depending on species and preparation method.¹² Cooking methods matter considerably: boiling and roasting both reduce protein content compared to raw specimens, with higher temperatures generally causing more protein loss.

Nobody is farming daddy long legs for food, and there would be little point in doing so. Harvestmen have such tiny bodies relative to their leg span that the caloric return would be absurd. But the broader point is that arachnids are not inherently dangerous to eat. Cultures that eat spiders tend to prefer large-bodied species like tarantulas, where there is enough meat to make the effort worthwhile. The edibility question has been answered for arachnids as a class: they are digestible, nutritious, and safe when properly handled. A daddy long legs is just an extremely small and unsatisfying version of a food category that already exists.

What About Kids Who Eat Bugs

If you’re reading this because your toddler just ate a daddy long legs, you can relax. Young children put things in their mouths constantly, and insects and arachnids are among the more common accidental snacks in the under-five crowd. Pediatricians field these calls regularly, and the standard guidance is that eating a single common household spider or harvestman requires no medical attention. No stomach pumping, no poison control call, no trip to the emergency room.

The only scenario where you might want to keep an eye on a child after they eat a bug is if the child has a known severe allergy to shellfish or dust mites, because of the tropomyosin cross-reactivity discussed earlier. Even then, a reaction from a single small arachnid would be extraordinarily unlikely. Watch for any signs you would normally watch for with an allergic reaction (hives, swelling, difficulty breathing) over the next hour, and if nothing happens, move on with your day.

Children who regularly eat soil and insects, a behavior known as pica when it becomes persistent, may deserve a conversation with a pediatrician for reasons unrelated to toxicity. The concern there is about nutritional deficiencies or behavioral patterns that might need attention, not about any danger from the bugs themselves.

Why the Myth Persists

The “most venomous spider” legend about daddy long legs has been around for decades, and it persists despite being thoroughly debunked. Part of the reason is that it has the structure of a perfect urban legend: a hidden danger in something familiar, a surprising reversal (the harmless-looking thing is secretly deadly), and a reassuring qualifier (but it can’t hurt you anyway). It is a story that feels satisfying to tell and satisfying to hear.

The myth also survives because the name “daddy long legs” is applied to multiple creatures, which creates a constant churn of confusion. Someone correctly learns that harvestmen have no venom, then encounters a pholcid spider called by the same name and assumes the venom claim must apply to that one. Someone else sees a pholcid kill and eat another spider and assumes it must have powerful venom to do so, not realizing that pholcid spiders use silk-wrapping techniques that let them subdue prey without needing potent venom.

The MythBusters television show tested the claim in 2004, allowing a pholcid spider to bite a human volunteer. The result was a brief, mild sensation that faded within seconds. The researchers who studied Physocyclus mexicanus venom reached the same conclusion through more rigorous methods: documented bites on humans produce only a mild sting with no lasting effects.² The myth is dead in scientific terms, but it will probably outlive everyone reading this article. Good stories have that kind of staying power.