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The Class Arachnida are the most familiar of the Arthropods outside of the ever-present insects, there are over 71 000 named species and they are united by the possession of eight legs, the lack of biting and chewing mouthparts (food is ingested in most cases as a liquid, though some help is often given the food in becoming liquid by the secretion of, or regurgitating onto or into the food of digestive enzymes from the stomach. |
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Have you ever wondered why insects stick to a spider's web but the spider doesn't? Some spiders have two or three claws at the tip of each leg. In web-weaving spiders, one of these claws has a special area that is used for hooking on to the strands of the web. The spider can use this special claw to swing from strand to strand without having to touch the sticky part of the web. In this way, a spider can move quickly over its web without getting stuck. |
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