With more than 100 different families and 40,000 individual species, spiders are among the most successful creatures on Earth. Highly adaptable, they live almost everywhere, from equatorial rainforest to Arctic tundra. And they come in a huge range of shapes and sizes, from the tiny Patu digua , measuring less than half a millimeter, to the immense bird-eating tarantula, which can reach a span of eleven inches. In The Private Life of Spiders , spider...