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.
Coastal Range newt
Their diet consists of small invertebrates such as worms, snails, slugs, insects and insect eggs, and amphibian larvae. They are known to be cannibalistic if other foods are in short supply. Newts capture prey by projecting out their tongue which has an adhesive texture.