Science Main Index
Spiders are found world-wide on every continent except for Antarctica. There are approximately 40,000 different species of spiders. Spiders vary in size from quite small to relatively large. The Goliath Birdeater can grow up to 10 inches measuring its leg span. Most people can easily recognize a spider by its eight legs. One spider, the Daddy Long Legs, is even named after its eight long legs. Another recognizable feature related to the spider is its web. Spiders have spinneret glands they use to build webs. These webs provide shelter and help catch food. Spiders also have fangs. Many spiders can inject a venomous liquid through their fangs. This venom is capable of paralyzing or killing predators or prey. Some venom, such as from the Brown Recluse or Black Widow, can even be dangerous or deadly to humans. Although some people are scared of spiders, most spiders will only bite humans in self-defense. Fear of spiders is called arachnophobia. Most spiders have four pairs of eyes. This provides them with very good vision. Some spiders, such as the Tarantula, can be very hairy. While many people are scared of the tarantula, this spider is generally quite harmless. Some people even keep a tarantula as a pet. Play the following videos to learn more about the spider.