Scientists estimate that there may be about 180,000 spider species in the world. They build their webs out of silk, which their own bodies produce and they pull out of two openings, or spinnerets, with their hind legs. Spiders rebuild their webs constantly, eating them and recycling the silk to make brand new ones. People tend to think that spiders are insects but they are classified as arachnids. There are some significant differences between the two.
Spiders have eight legs but ants, bees, beetles and other insects only have six.
Most insects have wings or antennae, but spiders do not. The arachnid classification includes daddy long legs, scorpions, mites, and ticks, too. Tarantulas, jumping spiders, black and brown widows, wolf spiders, garden spiders, funnel-webs, and brown recluses are just a few of the interesting types of spiders.