Black widow facts for kids
Quick facts for kids Black widow |
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Latrodectus
Walckenaer, 1805
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Black widows are a type of spider. Their scientific name is Latrodectus mactans. They are known for their shiny black bodies and round abdomens. A special red hourglass shape is found on the underside of their belly.
These spiders are related to "false widow spiders" (Steotoda), which are not dangerous to humans. However, true black widow spiders can give bites that are harmful. Their bites can be very serious, especially for young children or people who are already sick.
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What Do Black Widows Look Like?
Female black widows are about 1/2 inch (12 mm) long. This size does not count their legs. That's about the length of a paperclip! Male black widows are much smaller. They are only about half the size of the females.
Males are usually brown or gray. They have red or white spots. Male black widows are much less dangerous than females.
Where Do Black Widows Live?
Black widow spiders live in warm places around the world. They like to build their webs in safe, quiet spots. You might find them under things like overturned boxes on the ground. They are also often found under the seats of outdoor toilets.
Black widows prefer to be left alone. Because of this, they rarely come inside homes where people live.
What Do Black Widows Eat?
Black widows are predators. This means they hunt other animals for food. They mostly eat insects like flies, mosquitoes, and beetles. Sometimes, they even eat other spiders!
Black widows catch their food using their webs. When an insect gets stuck, the spider quickly wraps it in silk. Then, it bites the insect and injects venom. This venom makes the insect unable to move or kills it.
Black Widow Webs
Black widow webs are not as neat as some other spider webs. These webs are usually built close to the ground. They are found in dark and protected places.
The silk of a black widow web is very strong. It is even stronger than a steel thread of the same thickness! The spider uses its web for several important things:
- Catching prey: Insects get stuck in the sticky threads.
- Signaling danger: The spider can feel if something touches its web.
- Protecting eggs: The spider builds a special sac to keep her babies safe.
Life Cycle
The life cycle of the southern black widow is a fascinating journey of growth and transformation.
When a male black widow spider is ready to mate, he spins a small "sperm web." He then deposits a special fluid onto this web and collects it with his palpal bulbs (small, arm-like structures near his mouth). The male then uses these palpal bulbs to transfer the fluid to the female. After mating, the female black widow sometimes eats the male. This behavior is one of the reasons they are called "widows," though it doesn't happen every time.
After mating, the female gets busy laying her eggs. She carefully places them inside a round, silken container called an egg sac. These sacs are often camouflaged and guarded by the mother. A single female can produce anywhere from four to nine egg sacs in one summer! Each sac is like a tiny nursery, holding about 100 to 400 eggs.
The tiny eggs inside the sac usually take about 20 to 30 days to incubate, which means they are developing inside their shells. Once the eggs hatch, tiny spiderlings emerge. These little spiders are very vulnerable. It's rare for more than 100 spiderlings from a single sac to survive this initial stage.
As the spiderlings grow, they need to shed their outer skin, or exoskeleton, because it doesn't grow with them. This process is called molting. After their first molt, even fewer spiderlings survive, often around 30. This is because of challenges like not enough food, lack of safe places to hide, and sometimes even cannibalism among the spiderlings themselves.
It takes about two to four months for black widow spiders to grow enough to be able to reproduce themselves. However, they usually take six to nine months to reach their full adult size and maturity.
Lifespan
Female black widows are quite long-lived for spiders, often living for up to three years! Males, on the other hand, have a much shorter lifespan, typically only about three to four months.
Black Widow Bites
Like all spiders, black widows bite for two main reasons. They bite to catch food and to protect themselves. They bite insects caught in their webs to stop them from struggling.
Most bites on humans happen by accident. For example, if someone accidentally squeezes a spider, it might bite to defend itself. Humans are very sensitive to the venom from a black widow bite. The good news is that black widows usually try to run away if they can. If something big touches their web, they often drop to the ground and escape.
Are Black Widows Dangerous to Humans?
Only mature female black widows are capable of biting humans effectively. Their fangs (called chelicerae) are about 1 millimeter long, which is just long enough to inject venom into our skin. The much smaller males have fangs that are too short to cause a problem for humans.
The venom injected by a female black widow is called alpha-latrotoxin. It's a neurotoxin, which means it affects the nervous system. A bite can cause symptoms like pain, muscle cramps, and sweating, which are collectively known as latrodectism.
Here's the most important part: deaths from black widow bites in healthy adults are extremely rare. In fact, studies have shown zero fatalities among over 23,000 documented black widow bites in the U.S. between 2000 and 2008! While a bite can be painful and uncomfortable, it's almost never fatal for healthy people.
What to Do if Bitten?
If you think you've been bitten by a Black Widow spider, the most important thing to do is to tell an adult right away! Don't try to handle it yourself. Here's what an adult should do:
- Clean the Bite: Gently wash the bite area with soap and water. This helps to keep it clean and prevent infection.
- Apply a Cold Pack: Putting a cool, damp cloth or an ice pack wrapped in a towel on the bite can help reduce pain and swelling.
- Seek Medical Attention: It's very important to see a doctor or go to an emergency room as soon as possible. Even if you don't feel too bad at first, a doctor can check the bite and make sure you get the right care.
Medical Care for Black Widow Bites
Doctors are very familiar with Black Widow spider bites and know exactly how to help. When you go to the doctor, they will ask about your symptoms and examine the bite. They might give you medicine to help with the pain and muscle cramps. In some cases, especially if symptoms are severe or if the person bitten is very young or has other health issues, doctors might use a special medicine called an "antivenom." Antivenom is a medicine that helps to neutralize the spider's venom in your body, making you feel better faster.
With modern medical care, most people who are bitten by a Black Widow spider recover completely within a few days, though some symptoms might linger for a week or two. The key is getting to a doctor quickly so they can start treatment.
Cool Facts About Black Widow Spiders
- Their venom is about 15 times stronger than a rattlesnake’s.
- They usually live for about 1 to 3 years.
- Female black widows sometimes eat the males after mating. This is how they got their name, "black widow."
- Their most famous feature is the red hourglass mark on their belly. This mark can sometimes be orange or yellow.
- Black widows are nocturnal. This means they are most active at night.
See also
In Spanish: Black Widow para niños