The Australian redback spider is a highly toxic spider, mainly distributed in Australia, but also in New Zealand, Southeast Asia and Japan. The female spider is about 1cm long and has a black body with red or orange stripes and hourglass marks on her abdomen. The male spider is smaller and lighter in color. The venom contains a neurotoxin that can cause severe pain, swelling, and nausea after being bitten, but antivenom can be an effective treatment. It prefers to inhabit dark, dry environments, such as under rocks, firewood or outdoor furniture, and is nocturnal. Females live up to 2-3 years, males usually only 6-7 months.

Black widow is a strong toxic spider, belonging to the arachnid, arachnids, spherical arachnids. The body size is small, the body length is usually between 8-13mm, the female is larger, the male is smaller. The body color is black, with red or orange hourglass-shaped markings on the abdomen, which is its distinctive feature. Widely distributed in the temperate regions of North America, often inhabited in dry, dark places. The net takes the form of an irregular reticulated structure and is usually located near the ground. It feeds on insects and other small animals and catches prey through its powerful cobwebs. The venom contains neurotoxins, which are dangerous to humans and animals.

Spiders belong to arthropods. The body of a spider is divided into a head, chest, and abdomen, which are connected by a slender ventral stalk; The head has a pair of claws in front of the head, and the end of the claws is the venomous teeth of the venom gland duct; There are four pairs of feet on both sides of the chest, with hard claws at the tips of the feet; Spiders have single eyes, as well as eight eyes, six eyes, and four eyes. Wang Anshi's "Zishuo" records that a web was set up on one side, and when an object touched it, it was executed, hence the name "Spider". Spiders are distributed throughout China, mostly inhabiting eaves, corners of walls, and between trees, forming wheel shaped webs. Spiders have a diverse diet, mainly feeding on insects such as flies. They are tolerant to hunger, have strong reproductive ability, and have a long lifespan.

One of the most famous venomous spiders in the world of homeless spiders, living on the Pacific coast in the northwest. The homeless spider is also a type of funnel web spider, but it needs to be distinguished from the Australian funnel web spider. The medical understanding of its bite is still shallow and there is some debate. Spider individuals weave a funnel-shaped filamentous web and wait inside the web for insects to collide with it before hunting. Stray spiders sometimes nest in and around human settlements.