请使用英文介绍蜘蛛.

What is a Spider?
A spider is a predatory invertebrate animal with eight legs and two body parts, and no wings. They are often confused as being insects, but all spiders have 8 legs, unlike insects which have 6.

Spiders usually have silk-spinning organs at the back end of the body which they use to spin silk to construct cocoons for eggs or traps and webs for prey.

A spider is any member of the arachnid order Araneae, an order divided into three sub-orders: the Mygalomorphae (primitive spiders), the Araneomorphae (modern spiders) and the Mesothelae, which contains the Family Liphistiidae, containing rarely seen burrowing spiders from Asia.

All spiders are carnivores. They eat other species of arthropods including mites, crustaceans, mice, skinks and even other spiders.
The study of spiders is known as arachnology, although it is often included in the more general term entomology.

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