![]() ![]() Hatchling spiders (spiderlings) often produce a silk thread that allows them to disperse by "ballooning," i.e., being blown by wind currents to other areas. Some spiders carry this egg sac, while others deposit it somewhere within their nest. ![]() Female spiders wrap their eggs in a silken spun sac. Most spiders are identified by size, color, markings on the body, and the number (usually six or eight) and arrangement of eyes. The second section, the abdomen, bears the parts of the respiratory system (spiracles and / or book lungs depending on the type of spider), the digestive and reproductive systems, and the external organs used for spinning silk or webbing. ![]() The eyes, mouthparts ( Figure 4) and legs are found on the front section of the body, known as the cephalothorax. Unlike insects, which have three main body sections and six legs, spiders have two body sections and eight legs ( Figure 3). They are close relatives of ticks, mites and scorpions, which all belong in the group called arachnids. Biology of Spiders Skip to Biology of Spiders ![]()
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