Great question! And also, why aren't snakes poisoned by theirs? In general a creature that uses poison in some form CAN die from their own bite in the same way that you can die from your own stomach acid, urine, feces, bile, etc. if it gets into your blood stream. Various organs have their own fluids and microbial life that should not get into other organs! What might be even stranger is that you have bacteria in your mouth that can kill you if it gets into your lungs, and bacteria in your urethra that causes great problems if it gets into your bladder!
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Black widow Spiders are not affected by their own venom because they have developed a resistance to it. Their bodies contain specific molecules that bind to and neutralize the venom after it is injected, preventing it from harming them. This adaptation allows them to safely use their venom to immobilize prey without risking self-harm.
Experts in the field have suggested that males (smaller, and sometimes grayish) very rarely bite humans, and their venom is not as potent as the female. This applies to both the northern and southern Black Widow species, latrodectus variolus and latrodectus mactans.
White orb-weaver spiders are a common type of spider that are white in color. These spiders spin orb-shaped webs to catch their prey. White crab spiders are another type of spider that are typically white in color and can change their color to match their surroundings.
The spider you are referring to is likely the redback spider, which is a venomous species found in Australia. It is known for its distinctive black body with a red stripe or hourglass shape on its back.
A large red spot with a bump that is painful could indicate a bite from a spider, particularly a brown recluse or black widow, or an insect like a bee or wasp that injects venom. It is important to monitor the symptoms and seek medical attention if there are signs of an allergic reaction or if the symptoms worsen.
Black widows do not hibernate. They may become less active in colder temperatures, but they do not enter a true hibernation state. Instead, they may seek shelter in protected areas to survive the winter.