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C. Adlai, Software Developer, B.E (Bachelor of Engineering), California, USA
Answered Dec 16, 2019
Not all spiders are poisonous; there are a few spiders that do not come with venom glands so they will not have any poison even if they would try to bite their enemy or their prey. Other spiders will have their own poison. The levels of poison available may differ from one spider to another. There are some that are so poisonous that they can cause death within seconds.
Some will just cause a bit of inflammation and would need some treatment before people can recover. Some areas in the world may have more poisonous spiders, so people need to be more careful and make sure that spiders will not be lurking around the corners of their homes.
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A. Lucius, Senior Content writer, Diploma in Literature, Dover, Delaware
Answered Dec 10, 2019
Almost all spiders contain some levels of venom, but there are two small families of spiders that are not poisonous because they do not have venom glands. Not all spiders are poisonous, but there are also some that are poisonous but will not be a threat to humans.
There are some spiders that will cause pain that is similar to what humans may experience when they are stung by bees or by wasps. There are also some that are so dangerous that they can cause deaths among human beings. Most spiders will not do anything when they are left alone, and they normally use their poison when they want to paralyze their prey.