How Many Spiders Are Dangerous to Humans?
WouterWhen it comes to dangerous spiders, there are only a few that can really hurt you. These are called venomous species. The venom from these spiders is toxic. They can cause severe illness or even death, depending on the type. There are only about 30 spiders in the world that are known to be venomous.
The venom from some venomous species can cause allergic reactions in humans. These symptoms include swelling, itching, and fever. For these reasons, people who are allergic to spiders should avoid contact with these arachnids.
In the United States, there are six different types of poisonous spiders. Two of them, the Latrodectus and Phoneutria species, are more dangerous than the others.
The other three are the Brazilian wandering spider, the Australian funnel-web spider, and the brown recluse spider. While these spiders are less deadly than their cousins, they still can cause serious problems.
The Australian funnel-web spider is considered one of the most dangerous spiders in the world. This spider has a very potent neurotoxic venom.
Spider bites are extremely painful. The venom from these spiders causes respiratory arrest and cardiac problems. Other symptoms include nausea, vomiting, high blood pressure, and pain.
In Australia, the Atrax robustus has caused human deaths since the 1920s. It has also appeared in other countries as an invasive species.
Venomous spiders are usually found in dark areas. They are shy creatures, and will only bite when they are threatened. As a result, they are rarely seen in areas where human contact is possible.
