Understanding spiders

Spiders are predatory animals (carnivores), sometimes even cannibals. Its main prey are insects. Almost all types of spiders, with the exception of about 150 species of the tribes Uloboridae and Holarchaeidae, and the suborder Mesothelae, are capable of injecting venom through a pair of fangs into their enemies or prey. However, of the tens of thousands of species that exist, only about 200 species whose bites can harm humans.

Not all spiders make webs to catch prey, but all are capable of producing silk threads—thin but strong strands of protein fibers—from glands (called spinnerets) located on the back of their bodies. This silk fiber is very useful for helping the movement of spiders, swinging from one place to another, trapping prey, making egg sacs, protecting nest holes, and hearts.