Did you know that spiders have eight legs, a pair of fangs at the end of their abdomens, and spinnerets that extrude silk? Spiders are the largest order of arachnids and rank seventh in the diversity of species. Learn all about these fascinating creatures and learn how to protect yourself from them. Spiders are a dangerous and fascinating part of nature! Learn about their fascinating lives and fascinating facts. You can spot spiders up to 10 feet away. They usually hide in nooks and crevices. Spiders are found in many different shapes and sizes, each with its own unique characteristics and appearance. Over 30, 000 different species of spiders are known to exist worldwide, and scientists say there are many more that we don't yet know about. While we are all afraid of spiders, we don't know that they are dangerous or even dangerous. Spiders can play an important role in society and are not just a nuisance. The trachea was originally connected to the surroundings by a pair of spiracles. However, in most spiders, these spiracles have fused and moved to the posterior close to the spinnerets. These two types of lungs have very similar functions. In addition to allowing the spider to breathe air, spiders are capable of detecting light and temperature, as well as detecting air currents.