An amphibian's very thin skin isn't covered by fur, feathers, or scales. This makes them vulnerable to dessication and abrupt temperature change, but also offers several advantages. Amphibians can breath through the entire surface of their bodies. In the case of the lungless salamanders (Plethodontidae), gas exchange through the skin alone provides sufficient oxygen.

Water is also absorbed through an amphibian's skin making drinking unnecessary. Even in areas where open or running water is scarce, an amphibian's skin can absorb moisture from damp soil. Aquatic species would absorb too much water were it not constantly being expelled by their kidneys.

Amphibians display a startling variety of colour which results from different combinations of pigments within their skins. These patterns of colouration are usually designed to provide some form of defence from predators.

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