Opinions expressed by Forbes Contributors are their own. I write about the world of biology. There are over 45,000 species of spiders in existence, but here are three that are guaranteed to ..

The Goliath birdeater spider, native to South America's rainforests, is the biggest spider in the world, with a leg span reaching up to 12 inches (31 cm). The giant huntsman spider, found in Laos, ...