A Visual Guide to these Eight-Legged Wonders.Spiders are in the arachnid class, but not all arachnids are spiders. Most spiders use a web to catch their prey, which comes from spinneret glands on their abdomen, and each gland produces a different kind of silk - some sticky, some fine, and some for building.This Discover Spiders book provides a valuable introduction to these creatures and their world. Dimensions: 290 x 220mm Format: 48pp Padded Foil Omnibus