Do Spiders Give Birth to Live Babies?

A spider’s central nervous system is made up of two simple ganglia that are connected to various sensory systems. Unlike the organs of vertebrates and cnidarians, this system is not divided into chambers. It is instead a single tube, which is surrounded by a spherical membrane that is not separated into a ventricular system.

Some spider species are said to give birth to live babies. However, the majority of these spiderlings are not viable juveniles. Unless they are fed by the mother, most will die.

A spider’s egg sac is an elaborate structure, and is sometimes shaped like a cocoon. Depending on the species, it may be made of a multitude of layers, including silk, soil, extra tough silk, and multiple wrapped layers. During its life, it can hold hundreds of eggs.

Some female spiders carry their egg sacs in their jaws or on their spinnerets. Others leave their egg sacs in an obscure spot, under a rock or in a plant stalk.

Eggs of many spiders can be laid in a continuous stream into a silk egg sac. Depending on the species, the number of eggs may vary from four to 600 in a single sac. The amount of time it takes to hatch depends on the species.

Most spiders make an elaborate egg sac that can be used to identify the species. Some may hide it under a rock or a plant stalk, and some may place it in an area where the spider can overwinter.

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