Generally, with some exceptions, newts spend more of their adult lives in the water than salamanders. Also, there are more distinctive difference between the sexes in newts. . Eastern Newts are common North American newts. They are between and cms ( - inches) in length and they have a life expectancy of 12 - 15 years. They have a complex three stage life cycle; larvae, eft and aquatic adult; which is .
Common Newt Behaviour Common Newts emerge from hibernation in March, they breed through to May and generally the adult newts leave the water in July. They are one of the most terrestrial of the newts in Europe. When newts surface from the water for air, they make a characteristic ‘popping’ sound. Newts metamorphose through three distinct developmental life stages: aquatic larva, terrestrial juvenile (eft), and adult. Adult newts have lizard-like bodies and return to the water every year to breed, otherwise living in humid, cover-rich land habitats. Newts are threatened by habitat loss, fragmentation and pollution.
If the adult newts have not cannibalized the egg masses, larvae usually hatch after days. However, incubation may go on for up to 52 days depending on food availability and temperature of the water—the colder the water, the longer the incubation. Newt larvae resemble tadpoles with legs. They have bushy gills in younger developmental. The regeneration of amphibian myocardium has been studied most extensively in adult newts. The cardiomyocytes of uninjured newt hearts do not divide at detectable levels. Newts can survive excision of up to 30–50% of the ventricle.
The Eastern (red-spotted) newt is a widespread, native salamander of New York State and eastern North America that can live for years! Larvae live in water and use gills to breathe. However, juveniles (also known as "efts"), become land dwellers and develop lungs to breathe air. The adults also breathe air, but become aquatic once again. Immature larvae and adult newts live in small bodies of fresh water usually with mud bottoms. Adults can survive on land if their aquatic habitat becomes unsuitable, such as during dry periods when water is low. The juvenile eft stage lives in lakeshore and woodland habitats, and it is often seen in forest litter on rainy nights.