Spiders are a kind of bookbed animal with two body segments, four pairs of legs, without wings, and without a chewing mouth. Same with scorpions, hornbills, mites —all eight-legged.
Spiders can be found all over the world on every continent except Antarctica, and have survived for a long time in almost all habitats with the exception of air and sea colonization. Spiders are predators, sometimes even cannibals. Its main prey is insects. Almost all types of spiders can inject through a pair of fangs into enemies or prey. However, of the tens of thousands of species that exist, only about 200 species have a bite that can harm humans. Not all spiders make webs to catch prey, but all are capable of producing silk thread — a thin but strong strand of protein fibers — from glands (called spinnerets) located at the back of their bodies.
This silk fiber is very useful for helping the spider move, swinging from one place to another, trapping prey, making egg sacs, protecting nest holes, and so on.
