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Most spiders have a venomous bite. Each species has different toxins within the venoms. Some of those toxins are dangerous or fatal to man but not all.

The bite of a black widow, for example, can cause heavy abdominal cramping and intense pain. The brown recluse spider bite causes a puss filled lesion, where the victim risks amputation or infection antivenin is not administered quickly. The hobo spider bite is believed to have similar necrotic effects.

Venom is produced by specialized glands in the spider's body. In most cases, spiders use the chemical properties of the venom to liquefy the insides of their prey, making them easier to digest.

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βˆ™ 14y ago
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AnswerBot

βˆ™ 8mo ago

There are around 40,000 species of Spiders in the world, and estimates suggest that about 200 of these are considered medically significant to humans due to their venom. However, only a small percentage of these venomous spiders are considered highly dangerous to humans.

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βˆ™ 13y ago

None.

The term "poisonous" refers to a substance that is ingested, usually by drinking or eating.

However, there are numerous venomous creatures in Australia. They include:

  • the male platypus, which delivers its venom via a spur in its ankle
  • various snakes such as the Inland Taipan, Coastal Taipan, Tiger Snake, Brown snake and Red-bellied black snake
  • Spiders such as the Sydney Funnel web spider and the Redback spider
  • Marine creatures such as the Blue-ringed octopus, Box jellyfish, Stonefish and Irukandji
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βˆ™ 16y ago

approx. 2 billion species are poisonous in N. America

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βˆ™ 13y ago

The exact number of poisonus animals is presently unknow since we are constently discovering new ones

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βˆ™ 13y ago

2,900 species of poisonous snakes.

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βˆ™ 13y ago

none du

No. There are three.

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Q: How many poisonous spiders are in the world?
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