Well, all female spiders do.
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Yes, their egg sacs contain hundreds of eggs. Before they lay their eggs they will eat the male (go figure). Then, after they lay their eggs they will die.
No, spiders do not lay eggs when they bite. Spider bites are usually a defensive mechanism when the spider feels threatened. Female spiders typically lay eggs in a separate, secluded location.
They don't. They lay their eggs in sand. What you heard was a myth.
The number of eggs a spider lays varies depending on the species. Some spiders may lay only a few dozen eggs, while others can lay hundreds or even thousands of eggs at a time.
Spiders do not give birth. They lay eggs. Typically they lay their eggs in a silken sac of some kind that is sealed until the spiders start to hatch. The silken sac is carried around by some spiders such as the wolf spiders, or may be hung in or near to the spider's web. Different spiders have different places to keep their egg sacs safe.