Menemerus bivittatus – Gray Wall Jumper Identification (poisonous, bite size and lifespan)

Welcome to an exciting journey into the world of one of nature’s most agile and captivating creatures, the Menemerus Bivittatus, also known as the Gray Wall Jumper. This fascinating spider may not be as giant or famous as some of its arachnid relatives. Still, it boasts a set of characteristics that make it truly remarkable and worthy of our attention.

In the concrete jungles of our urban landscapes, the Gray Wall Jumper has carved out an existence that reflects its resilience, adaptability, and exceptional hunting prowess. From its unique jumping abilities to its stealthy camouflage against gray walls and structures, this spider is a testament to nature’s diverse strategies for survival.

Menemerus-Bivittatus – Gray Wall Jumper

This blog will delve deeper into the Gray Wall Jumper’s life, behavior, habitat, dietary preferences, and much more. We aim to shed light on the misunderstood world of spiders and foster a sense of appreciation and respect for these remarkable creatures.

Menemerus bivittatus is an exciting and impressive spider species worth learning about for anyone interested in the natural world.

Gray Wall Jumper

The Gray Wall Jumper (also known as the American gray jumping spider) is a small, common species of jumping spider found throughout North America. These spiders are relatively small, with females measuring between 6 and 10 mm in length and males measuring between 5 and 6 mm in size. They are known for their ability to jump several times their body length to catch prey.

The Gray Wall Jumper has a distinctive appearance, with a light gray to brownish-gray body and dark gray or black stripes on its legs. The top of the spider’s cephalothorax (head and thorax) is covered in short, dense hairs, which give it a fuzzy appearance. The spider’s eight eyes are arranged in two rows, with the front row containing two large eyes and the back row containing six smaller eyes.

These spiders are commonly found on walls and other vertical surfaces, hunting for small insects and prey. They are moving quickly along walls or jumping to catch prey. Despite their aggressive hunting behavior, Gray Wall Jumpers are not dangerous to humans and are not known to bite unless provoked or threatened.

Menemerus-Bivittatus – Gray Wall Jumper

Size of Menemerus bivittatus

Adult females typically range from about 7 to 12 millimeters in length, while adult males are slightly smaller, usually between 6 and 9 millimeters in length.

These sizes vary somewhat depending on the spider’s age, diet, and overall health. Despite their relatively small size, these spiders are impressive jumpers, capable of leaping several times their body length to catch prey or evade predators.

Web of Gray Wall Jumper

The Menemerus bivittatus, like other jumping spiders, does not build a traditional web to catch prey. It significantly differs from the stereotypical behavior we often associate with spiders.

Jumping spiders are active hunters known for their incredible eyesight and agility. Instead of trapping them in a web, they stalk and pounce on their prey, much like a cat. Their excellent vision, which is among the best of all invertebrates, supports this hunting method.

However, that does not mean they don’t use silk at all. These spiders create silken “safety lines” while they move about. This line prevents them from hitting the ground if they miss a jump or fall. They also weave small web retreats or shelters where they can hide, rest, molt, or lay eggs. But these webs are not designed to catch prey.

Bites of Gray Wall Jumper

The Gray Wall Jumper does possess venom to incapacitate its prey; it poses minimal risk to humans. Like most jumping spiders, their first line of defense is to flee rather than bite. However, they may bite in self-defense if they feel threatened and have no escape route.

If a bite does occur, it’s usually compared to a bee sting regarding pain and symptoms. Most people experience mild symptoms such as redness, swelling, and minor pain at the bite site. Severe reactions are infrequent, typically occurring only in individuals with specific allergies to spider venom.

It’s important to remember that these spiders are not aggressive toward humans and prefer to avoid interaction. If you find a Gray Wall Jumper in your home or vicinity, the best action is to carefully capture it in a container and release it outside rather than trying to handle it directly.

See medical attention immediately if any spider bites you and experiences severe symptoms such as difficulty breathing, nausea, or intense pain. While extremely rare, these symptoms could indicate a severe allergic reaction.


The lifespan of Menemerus Bivittatus, or the Gray Wall Jumper, has yet to be definitively known due to the difficulty of studying spiders in the wild and the differences between captive and natural lifespans. However, it’s generally accepted that many jumping spiders live for about a year, with some surviving up to two years in captivity. This lifespan is typical of many spiders: they hatch from eggs in the spring, mature throughout the summer, and the adults die in the fall or winter.

It’s important that there can be quite a bit of variation in spider lifespans based on factors like species, sex, diet, climate, and predation. Female spiders often live longer than males. In many spider species, males die shortly after reaching sexual maturity and mating, while females can live longer, especially if they are protected and well-fed in a captive environment.


Can you keep bold jumping spiders as pets?

Yes, Bold Jumping Spiders can be kept as pets. They’re generally easy to care for, requiring small enclosures, occasional feeding, and a stress-free environment to thrive.

Is it safe to hold a jumping spider?

Yes, it’s generally safe to hold a jumping spider. They’re not aggressive, and their bites are rare and usually harmless. However, handle them gently to avoid causing them stress.

Are jumping spiders strong?

Jumping spiders are strong for their size. They can leap up to 50 times their body length, and their robust, muscular structure aids in overpowering and capturing prey.


In conclusion, the Menemerus Bivittatus, more colloquially known as the Gray Wall Jumper, is an intriguing creature that fascinates professional arachnologists and amateur spider enthusiasts alike. Their distinctive jumping ability and uncanny camouflage against gray urban landscapes make them one of the most captivating species in the spider kingdom.

Menemerus-Bivittatus – Gray Wall Jumper

These spiders also play a crucial role in the ecosystem, acting as natural pest control agents by preying on smaller, often harmful, insects. By understanding their behaviors, habitats, and dietary preferences, we are better equipped to appreciate their presence rather than fear it, which is usually a common reaction to spiders.

Yet, as with any creature in our shared habitat, human-spider coexistence hinges on respect for these little beings and their ecological significance. It’s essential to remember that the Gray Wall Jumper, like other spiders, is not a threat but a fascinating part of our biodiversity that deserves our understanding and protection.

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