A handy, pocket-sized guide to 220 of the world's spiders, Gem Spiders is the perfect introduction to these 'creepy-crawlies' There are approximately 35,000 known species of spider in the world, but it is estimated that the true number in existence could be nearer 70,000. They occur everwhere naturally and, because of their sharp bite and venom, they are one of the most successful groups of animal. Each entry includes: A photograph of the spider and details of any distinguishing features which may help identification Information on size, web, habitat, distribution range and the times of the year when it is most likely to be spotted An icon shows the potency of each spider's venom Each species is sorted by family and illustrated with a symbol, enabling you to quickly find what you are looking for. There is a detailed introduction which covers aspects of spiders' natural history, their relatives, anatomy, the production and uses of silk. From the Goliath Tarantula to the patu digua, this photographic guide is the perfect introduction for those who want to learn about these fascinating creatures.