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The maximum length of continuous silk that can be obtained from a cocoon is measured at $900$ metres. This is the highest observed, however the length may vary in most cases as different cocoons are of different size and shape therefore having varied amount of silk within them.
Silk is obtained from cocoon of the silk moth.
$1.$ Cocoons are collected and kept under the sun, or boiled, or exposed to steam. This helps in separating the silk fibres.
$2.$ Then, the spinning of silk fibres into threads is done.
$3.$ The silk threads obtained are then woven into desired clothes.
Sheep, goat, Camel, Yak, etc. bear hair of two different types coarse hair and fine soft hair. Fine soft hair is found close to the skin in these animals. The fine soft under hair is called fleece. Fibre for wool is obtained from the fleece (hair) of such animals and hence such animals are called wool-bearing animals.