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Why a spider can give only some silk?
A spider generates silk in specialized glands in its abdomen and creates the silk strands using a spinning organ called a spinneret.
Some spiders produce up to seven types of silk, each with its own purpose and attributes.
Each of the spinnerets (most spiders have six) has a complicated internal musculature that allows them to move both independently and work together in a coordinated manner.
In this way, the spider can produce one kind of silk to create a soft, cushioned egg case that is then surrounded by a tough, parchment-like wrapping.
A spider can also make web to catch his prey, for this purpose spider makes a web from a different type of sticky type of silk fibre.
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