Spiders are predators (carnivores), sometimes even cannibals. Its main prey is insects. Almost all types of spiders, with the exception of about 150 species of the Uloboridae and Holarchaeidae tribes, and the Mesothelae subordo, are able to inject through a pair of fangs to their enemies or prey. However, out of tens of thousands of species, only about 200 species have bites that can harm people.
Not all spiders make a net to catch prey, but all are capable of producing silk threads-a thin but powerful strand of protein fiber-from a gland (called a spinneret) located at the back of its body. These silk fibers are very useful for helping the movement of spiders, swinging from one place to another, trapping the prey, making egg bags, protecting the nest hole, and so on.
