Snake

A snake sheds its skin several times a year.  When a snake grows, its skin does not grow with its body.  Instead, the snake grows a new skin underneath the old one.  Eventually, the old skin becomes too tight, and needs to come off.

The snake begins to shed its old skin by rubbing its nose on a rock or a tree trunk in order to loosen the skin around its mouth.  Then, by crawling through rocks and brush, the snake manages to wriggle headfirst out of the old skin.  The skin frequently comes off whole, turned inside out.  This process is called molting.–Dick Rogers

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