Summarize the following:
The highly aggressive Sydney funnel web spider resembles a glossy tarantula and is found in dark, moist environments in South-Eastern Australia. A bite requires immediate professional medical attention as envenomation symptoms progress quickly. Initially the intensely painful bite will show little inflammation or blistering, but the person will sweat, have facial twitches, and may feel tingling around the mouth. Anti-venom does exist, and should be administered at a hospital as soon as possible. Brazilian wandering spiders are large, aggressive nocturnal spiders found in South America. They are usually are brown and hairy, with a two inch long body and a black marking on the belly. Wandering spiders build no webs, roam at night, and can be found in banana clusters or hiding in dark environments. Their bites produce localized swelling and pain that radiates toward the torso, and may be accompanied by symptoms of nausea, vomiting, hypertension, breathing difficulties and, in males, an erection. Anti-venoms exist to help relieve symptoms, and deaths are rare. Brown recluse spiders can be many different shades of brown, but they have a violin-shaped marking on their back and long, spindly legs. Their bite initially stings, then deepens into intense pain over the next eight hours. A fluid-filled blister that turns into a steadily-enlarging open sore appears, and permanent tissue damage is preceded by a blue and red "target sign" around the wound site. Other symptoms include a fever, rash, and nausea. Brown recluse spider bites can produce scarring, but have caused no deaths in the United States. There is no anti-venom, but treatments of bite lesions exist via surgery and antibiotics. Black widows are large, glossy black spiders with a red hourglass shape on their belly. They are found throughout North America. The bite may feel like a pinprick, and the site of the bite will be slightly red and swollen. Within thirty minutes to a few hours, however, intense pain and stiffness will begin. Severe abdominal pain, nausea, fever or chills may develop. Black widow bites are generally not fatal to healthy adults because a vaccine is usually readily available. However, if left untreated, people can lose limbs. It's important to note that black widows and brown recluses are the only two types of dangerously poisonous spiders in the US. They both reside in warm climates and prefer dark, dry places like closets and wood piles. Closely related to black widows, redbacks are found all over Australia, particularly in urban areas. Only female redback spiders are dangerous. These have a black (sometimes brownish) pea-sized body with a red stripe on the upper abdomen and an hourglass-shaped reddish orange marking on the underside of the abdomen. A redback bite will produce sweating, vomiting, nausea, muscular weakness, and pain, which may be excruciating. Since the invention of redback anti-venom, no deaths have occurred as a result of a redback bite.
Look for a Sydney funnel web spider's tarantula-like body. Notice the Brazilian wandering spider's large, hairy body. Look for a fluid-filled blister to indicate a brown recluse bite. Keep an eye out for the red hourglass marking on a black widow. Take note of the redback spider's red abdominal stripe.