Why snakes shed an outer layer of skin
Snakes periodically replace the outer layer of their skin through shedding, or ecdysis. A new layer forms beneath the old one before separation occurs. This renewal supports growth and replaces worn surfaces; snakes do not simply keep stretching the same outer covering indefinitely as their bodies become larger.
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A new surface forms before the old one leaves
A snake's skin includes an outer keratinised layer. During the shedding cycle, replacement layers develop underneath, and changes between the layers allow the older surface to separate.
The snake often rubs against a suitable surface to begin peeling the old covering away. Under favourable conditions, it may come off as a largely continuous piece.
Shedding is a normal renewal process. Growing snakes often shed more frequently, but adults also replace their outer covering.
- New surface tissue develops below the old layer.
- Separation prepares the covering to come away.
- Movement helps remove the loosened skin.
The transparent scale over the eye is included in the shed covering. Its changing appearance before shedding can make the eyes look cloudy, which is part of the process rather than a separate eyelid closing.