Crab spiders are common inhabitants of gardens and natural landscapes worldwide. They are named for their unique physical characteristics and movement, which often resemble those of a crab. These fascinating arachnids do not construct webs to capture prey but instead rely on camouflage and ambush tactics.
Crab Spider Biting Behavior
Crab spiders can bite, but such incidents are rare. They are not aggressive towards humans and generally prefer to flee or remain motionless if disturbed. Most species have mouthparts too small to pierce human skin effectively. Even larger crab spiders are unlikely to bite unless provoked. Their primary use for venom is to immobilize insect prey, which can often be much larger than the spider itself.
Understanding a Crab Spider Bite
The effects of a crab spider bite are generally mild and not considered medically significant to humans. Symptoms commonly include localized pain, slight redness, and minor irritation or swelling at the bite site. The sensation of a bite is often compared to a mild bee sting, with symptoms typically subsiding within a few hours. Crab spider venom is potent enough to subdue insects.
For basic first aid, it is recommended to clean the bite area with mild soap and water. Applying a cool compress or ice pack can help reduce pain and swelling. Elevating the affected area and taking a non-prescription pain reliever can also provide relief. If the bite becomes itchy, an antihistamine or steroid cream might be helpful. While complications are uncommon, any signs of worsening symptoms, such as increased redness, swelling, or pus, should prompt medical attention to check for infection.
Spotting a Crab Spider
Their most notable feature is their crab-like appearance, with the first two pairs of legs being noticeably longer and thicker than the others. These front legs are often held extended to the side in a raptorial, or grasping, posture, which helps them seize prey. Crab spiders can also move sideways or backward, further contributing to their crab-like moniker.
Many crab spider species exhibit remarkable camouflage abilities, with some capable of changing their color over several days to match their immediate surroundings, such as flowers or foliage. They come in various colors, including white, yellow, green, brown, and even pink, allowing them to blend into their typical ambush habitats. Crab spiders are commonly found on flowers, plants, and in gardens, where they patiently wait for insects like bees and flies.