The variety of color patterns is not the only difference between the Black Widows. This species can also be distinguished by differences in hunting methods, physical characteristics, net weaving, egg pack shape, shelter, body size, mating methods, etc. Different species can be distinguished even in terms of toxicity. It should be noted that adult males do not have venom glands.

When you are bitten by a female black widow, your risk of dying is only five percent. However, there is no canonical grade for Black Widow's toxicity, whichever it falls under. Once bitten by L. pallidus (white widow of Kenya) or L. bishopi (red widow of flower-backed) (considered the least venomous variety) it still gives you unbearable pain.

Although minor bites, their toxicity directly affects the central nervous system and muscle tissue. (See Toxicology for more information.) A victim of a black widow bite will immediately experience acute, severe pain because the toxin directly stimulates your oversensitive central nervous system, along with other Unpleasant side effects.

Latrodectus geometricus is distributed in Africa; L. curacaviensis is distributed in South and North America; Porcupine spiders (L. hystrix), L. dahli and pale The spider (L. pallidus) is distributed in southern Europe, North Africa and southwest Asia; the venomous spider is distributed in warm regions around the world;

In the northern part of its range, venomous spiders are commonly found near garbage dumps and homes. Curacavik spiders live in logs, under stones and in woodlands and fields. In the southeastern United States, the kuracavicula lives on trees or shrubs on the ground; venomous spiders live on the ground.

The female of the venomous spider is the most common spider in North America, black, shiny, with a red hourglass pattern on the ventral surface of the spherical abdomen, sometimes with two small red spots without the hourglass pattern . Body length is about 2.5 cm (1 ??). The size of the male body is only 1/4 of that of the female body. Because the male body is often eaten by the female body after mating, it is rarely seen. In addition to the hourglass-shaped pattern, there are 4 pairs of light red stripes on the side of the male abdomen. Black Widow's web is large and funnel-shaped in the middle. The female spider lays several groups of eggs in summer. The egg bags are hung on the net, white or brownish-yellow, paper-like in texture, up to 12 cm (0.5 mm) in diameter, and contain 250 to 750 eggs. 14 to 30 days to hatch young spiders, orange or white. Female spiders live more than a year and a half. Like most spiders, black widows feed on insects. Bite a small hole in the worm's body to suck its body fluids. Natural enemies are mud wasps, parasites and predators. It is 10 times more poisonous than a rattlesnake. After being bitten, people suffer from severe pain, nausea and mild paralysis of the diaphragm, but most of them can recover without serious complications.

When you see this cute animal redback spider, you may not think it is one of the two most venomous spiders in Australia - its original name is Black Widow Spider (Black Widow Spider) (The other is called a coffin spider).

Being bitten by a redback spider is hard to notice at first, after five minutes the wound begins to become hot and painful, and after three hours, a major attack begins: profuse sweating, muscle weakness, nausea, vomiting, tinnitus, heartbeat Accelerated or irregular beating, fever, fright and other symptoms, if not dealt with in time, can lead to death.

Redback spiders like to build their webs in places where one side of the web faces the sun and the other side is shady, such as under the edge of a house or where the gutter is open.

Like all spiders, they are carnivores (meat-eaters are more accurate than meat-drinkers), they first stun animals that live in their webs with their venom, and then break down their flesh into a liquid and then suck its flesh.

Redback spiders are typical self-feeders: not only do female spiders eat their male spiders after mating, but when living conditions are difficult and food is lacking, they eat their own species. Sometimes the spider growing in a nest of small spiders grows entirely by feeding on its companions, which perfectly expresses its animal optimization ability for survival of the strong.

Female redback spiders live two to three years, male spiders six to seven months. Spiders are very productive. After mating, female spiders store semen. When conditions are good, they will lay eggs every 25-30 years, and they can lay 5,000 eggs in their lifetime. Each nest of small spiders takes about 12-14 days to hatch, and they live together for about 14 days. Then they pull the silk from the belly and float down the wind. The landing point of the spider silk is their landing point. start a new life.

The venom of the black widow is 15 times more powerful than that of the prairie rattlesnake. In the American market, its value is thousands of times more expensive than gold, at least $2.3 million an ounce. Known natural fibers, even steel wires and Kevlar fibers, which are known for their toughness, are far behind. Its toughness can extend 27% before breaking, and its strength is more than twice that of ordinary spider silk.