About Erin M

As an entomologist at the Cockrell Butterfly Center, Erin designs, creates, and maintains exhibits for the Entomology Hall, raises and cares for live insects and insect relatives, and educates the public about the wonderful world of bugs.

A spider in your fruit? Unlikely, and less likely to hurt you.

This year we’ve seen a rash of negative publicity about “deadly” spiders hitchhiking in fruit from Central and South America, causing arachnophobes everywhere to, well, be super paranoid! In fact, spiders have not fared well in the media at all this year. Just check out some of these headlines:

Woman jumps from car after seeing spider, causes crash

Loose tarantula prompts Delta to call off flight

Man sets fire to gas pump trying to kill spider

So what’s the deal? Are spiders rising up against us by invading our fruit, vehicles, and homes? No. People are overreacting and the media is having a field day! We wanted to shed some light on what’s really happening and what you should do if you’re ever faced with a similar situation.

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The redfaced banana spider, Cupiennius chiapanensis, from Central America is a harmless spider often misidentified as a potentially deadly spider from the Amazon in South America. Photo by: Rick Vetter.

Spiders hitchhiking in fruit — should we be concerned? Absolutely not; this is nothing new. Spiders and other arthropods have been accidentally hitching a ride in produce since it started being imported into the United States. Bunched fruits such as grapes and bananas make excellent hiding places for small insects and arachnids. Banana plantations, orchards, and vineyards attract plenty of insect visitors, both beneficial pollinators and detrimental pests. All of which make an easy meal for hungry spiders, so these are wonderful places for them to call home.

This can be a great thing for us because the spiders help control the pests, which can greatly reduce the amount of pesticide used on our food. But, obviously, when these fruits are harvested, it can bring them into our supermarkets and even our homes. The good news is that in the unlikely event you find a spider hiding in your fruit basket, it’s probably not a harmful one, according to arachnologist, Rick Vetter, who has been studying and identifying spiders brought into the country this way since 2006.

Most of the spiders that appear in banana shipments from Central and South America are either the pantropical huntsman spider (Heteropoda venatoria) or the red-faced banana spider (Cupiennius chiapanensis). Both are large spiders that can be misidentified as Brazilian wandering spiders, and both are harmless.

There have been several reports this year, mostly from the United Kingdom, of “deadly Brazilian wandering spider” eggs being found in banana shipments. The articles detailing these accounts have so many problems, it’s just mind boggling to me that they’re published and taken as any sort of reliable or accurate information. One article states that a woman purchased a bag of Tesco bananas and found an egg sac. After searching through Google, she saw an image that looked similar to hers, so she determined herself that they must be Brazilian wandering spider eggs. Hmmmm, interesting, wow, Google really can tell you EVERYTHING!

Another article states that a family “fled their home” after finding an egg sac on bananas from Aldi and an “expert,” some guy who runs a wildlife sanctuary, told them that “on the balance of probabilities, it was probably eggs from a Brazilian Wandering Spider.” Wait… what? That sentence doesn’t even make sense, come on, people!


The pantropical huntsman spider, Heteropoda venatoria, is a harmless spider found in many tropical locations around the world including Florida and Hawaii. Photo by: Rick Vetter.

The main problem here is the lack of an actual expert to identify the suspected eggs. Many trained entomologists cannot even correctly identify the actual spider, let alone their egg sack. Anyone who is not an entomologist or arachnologist is definitely not going to get it right!

Another major problem is with the media automatically labeling something as a “deadly Brazilian wandering spider” or “the deadliest spider in the world,” which creates so much hysteria. It makes people think that if they find a spider or eggs in bananas, it must be this kind, it will bite you, and you will die. But let’s look at the facts.

Brazilian wandering spiders are actually a genus of spiders (Phonuetria) found all over Central and South America. Each species in this genus has a different geographical range, size, behavior, and venom toxicity. The species reported to have the most toxic venom, Phonuetria fera, is restricted to the Brazilian Amazon and two similar species, P. nigriventer and P. keyserlingi, are restricted to the Atlantic coast of Brazil. The two latter species are the ones usually involved in envenomations of humans in Brazil, as P. fera is usually far from banana plantations and not likely to come into contact with people or get into banana shipments. Furthermore, most banana shipments these days come from places like Ecuador and Costa Rica, not Brazil. This is not to say that other species in this genus found in Central America don’t occasionally get into shipments, because they can, and have. But these species are usually smaller and have less toxic venom.

The toxicity of the venom is always exaggerated as well. In a study of 422 bites from Phoneutria spiders in Brazil, only 2.3 percent of them had to seek treatment with antivenin, and only one death occurred. Most people had minor symptoms that resolved on their own. This is true when it comes to any spider considered “dangerous” like the black widow, brown recluse, or Brazilian wandering spider. Most spiders only bite in response to a threat they cannot escape from, such as being trapped.


Brazilian wandering spider.

If you succeed in doing this to a spider, the bite is a defensive one, which may not even result in envenomation. Most types of spiders, especially from North and South America, are capable of saving their venom and delivering a “dry bite.” If venom does make it into your system, it is most likely a very small amount that will cause no reaction or a very minor reaction. People who are sensitive may experience unpleasant symptoms and may even need to be treated at a medical facility to control these symptoms, but death is highly unlikely. The groups of people most susceptible to venom are small children, the elderly, and those with compromised immune systems. Obviously those in any of these categories should be protected from spider bites, but knowledge and education are the best way, not overreaction and hysteria!

So if you do happen to bring home fruit and find a spider lurking there, don’t do what these people did. Don’t flee your house or try to sue the supermarket. (It’s not really their fault!) Don’t call the media or 911. First, try to contain the spider or eggs by placing the bananas in a sealed plastic bag or box of some kind. It’s important to keep it intact for proper identification, a smushed spider is very hard to identify! If the spider drops to the counter or the ground, try throwing a cup or glass over it and slipping a piece of paper underneath to trap it inside. From there you can preserve it in the freezer, which will kill it, or the refrigerator which will slow it down until you can get it to someone for a proper identification. It’s not a bad idea to give the store at which you purchased the fruit a call, just to let them know you found a spider in their produce and you’re trying to get it identified.

banana spider

Finding a spider in a food product can be jarring, but don’t freak out. It’s most likely harmless. Report the spider to grocery store personnel or call an entomologist to be sure of the species.

Next, find an actual expert to identify the spider. Stay away from pest control companies, they don’t always have an actual entomologist on staff, but they will be happy to give you a wrong answer and then tell you that your house needs to be sprayed for extra precaution. Call a university or museum and ask for an entomologist. If they don’t have one, they will know where to find one.

Deliver the spider and wait for an answer. Most likely the results will come back as a harmless spider of some kind. In some rare cases, it may be a type of Brazilian wandering spider or perhaps a black widow. (This has happened.) As long as you kept a cool head and caught and isolated the spider without picking it up with your hands, you were not bitten by it! Call the store and tell them what type of spider it was. Then, move on with your life.

And for goodness sake, if you see a spider on or near you, don’t jump from a moving car or try to set it on fire in the proximity of highly combustible chemicals. These other things will kill you, the spider will not!


Stay cool in the rainforest: summer events unfold at the Cockrell Butterfly Center

Summer is here and the kids are out of school, so what better time to escape the heat and join us here at HMNS for some cool and educational arthropod experiences! The Cockrell Butterfly Center will be welcoming back a popular summertime program and introducing a couple of new ones which will be sure to excite the bug lover in everyone! Every week this summer, we will be giving you a chance to get up close and personal with some of our famous residents on three different days. Here’s a little about what we’ll be up to…

Small Talk: Tuesdays at 1 p.m.

Small creatures, big information! Every Tuesday, in the Children’s Area on the main level of the CBC, we will be introducing you to a different resident of the Brown Hall of Entomology. Our entomologists will bring out our biggest and most exotic creatures as well as some familiar (or not-too-familiar) Houston natives. Giant katydids, Atlas moths, and odd arachnids are just some of the creatures you will meet. Each talk will fill your head with all kinds of cool information and facts about our feature creatures. Afterward, we will answer any questions you may have. Up-close viewing and sometimes touching will be permitted, and definitely feel free to bring the camera!

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Wing It!: Wednesdays at 10:30 a.m.

At the CBC, you can watch brand-new butterflies emerging from their chrysalises, pumping blood into their newly formed wings, and preparing for their first flight. After this, enter the rainforest filled with lush tropical plants and hundreds of butterflies fluttering through their naturalistic habitat. But, how do they get there? Every Wednesday morning, join our entomologists outside of the Chrysalis Corner in the Brown Hall of Entomology. We will talk about a typical butterfly release and answer questions. Then, you can walk into the rainforest and watch as brand new butterflies take their first flight in their new home. Touching of the delicate butterflies will not be permitted, but please feel free to take as many pictures as you want.

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Friday Feeding Frenzy: 9:30, 10, 10:30, and 11:30 a.m.

The main event! Get ready to see huge, ferocious, carnivorous insects and other animals feast on their prey in front of your very own eyes! This Friday and every Friday throughout the summer, the Cockrell Butterfly Center will be feeding a live animal for your viewing pleasure. We have several arthropods and even some reptiles that we will showcase. Here is a little about the line-up…


Green Tree Pythons (Morelia viridis): Our green tree pythons, Kaa and Nagini, will be ready to dine on mice! These snakes are native to Indonesia, Australia, and New Guinea. Pythons are non-venomous snakes that subdue their prey by constricting. Their food consists mostly of small mammals and the occasional reptile. They lay in wait, curled around a tree branch, and when potential prey approaches, they strike from an “S” position, using their tails to anchor themselves to the branch. Once their prey is snagged, it’s lights out!

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Giant Asian Mantis (Hierodula membranacea): This praying mantis, one of the largest species, comes from Southeast Asia. Mantises are ambush predators and have several features that ensure their success in catching prey. Their amazing camouflage allows them to resemble either living or dead parts of plants, flowers, tree bark, stones, or sticks. Not only does this help conceal them from predators, it also keeps potential prey oblivious to their presence. An insect that wanders too close is snatched by raptorial front legs (legs specialized for grabbing) and held still by several tough spines. The mantis uses chewing mandibles to eat its victim alive. Mantises have excellent vision at close range and can see as far as 20 meters. Their eyes are large and located on the sides of their head, allowing the insect to see all around itself. They can keep their eyes on potential prey by inconspicuously moving their heads up to 180 degrees. Nothing can escape their field of vision. Most mantises feed on smaller insects, but some giant species can take down small reptiles, amphibians, and even rodents!


Giant Centipede (Scolopendra heros): Centipedes are predatory, long-bodied arthropods with many pairs of legs – one pair per body segment. Centipedes are venomous and can be dangerous, so they are not to be confused with the congenial millipede, which poses no threat to humans and has four legs per body segment. This centipede, AKA the giant red-headed centipede, can run very quickly to pursue and catch its prey, which it immobilizes with repeated bites from two venomous fangs. Once dead, the prey is devoured. Giant centipedes of this and similar species are found in Mexico and the southwestern United States. The coloration, known as aposematic or warning coloration, serves as a message to other animals: “Touch me, and you’ll get more than you bargained for!” A bite from one of these can cause intense pain that lasts for hours or days and can cause a severe reaction in someone who is allergic. These hunters take down smaller arthropods, small reptiles and amphibians, small rodents, and have even been known to hunt tarantulas!

Wolf Spider (Hogna carolinensis): This is the largest species of wolf spider found in the United States! Most wolf spiders are large and can sometimes be confused with tarantulas. The name wolf spider refers to their hunting behavior. Instead of building a web, they wait to ambush their prey and at other times, they chase it for a short distance. Wolf spiders inject venom into their prey to immobilize it. They then use digestive enzymes to liquefy the insides and then slurp it up through a tube that leads to the stomach. Wolf spiders have no interest in biting people, but will if provoked. The severity of their bite has been compared to that of a bee sting.

Goliath Birdeater Tarantula (Theraphosa blondi): This is the big mama of all tarantulas and regarded as the largest spider in the world. They can reach a weight of 5.3 ounces (more than a quarter pounder) and have a leg-span of 12 inches (about the size of a dinner plate). The name birdeater is a misnomer as they do not eat birds, although they could. They are native to marshy swamplands in South America, and like other large spiders, they feed on mostly insects. However, because of their size, they often go for small reptiles, amphibians, and rodents. If threatened, these tarantulas can produce an eerie hissing noise by rubbing together setae on their legs. If that doesn’t creep you out enough to stay away, watch out for the urticating hairs they kick off their abdomens into the air. If these hairs come into contact with your skin, you get really itchy, and you don’t even want to know what happens if they get in your eyes! Birdie is our resident birdeater and she’s a thrill to watch as she shoves as many crickets into her mouth as possible!

So if creepy crawlies are your thing, visit the CBC this summer, and witness the goings-on of our staff and our tiny, fascinating residents.

How to Spread and Mount a Butterfly – Part III


HMNS entomologist Erin Mills walks you through how to mount and display a butterfly in this 4-part video tutorial.

Part III: Setting the Butterfly

Part III continues below:

 Check back next week for our final installment of this video series.