Newt
Newts, as with salamanders in general and other amphibians, serve as bioindicators because of their thin, sensitive skin and evidence of their presence (or absence) can serve as an indicator of the health of the environment. Most species are highly sensitive to subtle changes in the pH level of the streams and lakes where they live. Because their skin is permeable to water, they absorb oxygen and other substances they need through their skin. Scientists study the stability of the amphibian population when studying the water quality of a particular body of water.
Wildlife of Alaska
The Taricha Granulosa, or Rough-Skinned Newt, is a salamander in the caudata order. This newt is multicolored, typically light brown on the back and yellow bellied, but can sometimes be olive green on the back. The Rough-Skinned Newt is capable of growing up to 26.1 centimeters and will typically reach at least 12.7 centimeters. The newt's name comes from the granular and rough texture on their skin. The skin on the newt is toxic and releases a powerful neurotoxin called Tetrodotoxin, which can effect mucous glands and skin.