Amphibians

Sierra Newt

Taricha sierrae · also called Sierra newt, Sierra Nevada newt

Least Concern ↓ carnivoreinsectivore Mountains Temperate forest Rivers & wetlands

A Sierra newt is the California newt’s mountain twin — a stout, warty, orange-bellied newt that biologists only recently split off as its own species, based on genetics rather than looks. It carries the same pufferfish poison in its skin, it breeds in the flowing streams of the Sierra Nevada foothills, and every spring its migration to those streams sends thousands of newts across the roads.

Overview

The Sierra newt, Taricha sierrae, lives in the western foothills and lower forests of the Sierra Nevada in California, from Shasta County to Kern County. For most of the year adults are on land in oak woodland, chaparral, and conifer forest, hunting worms, slugs, insects, and amphibian eggs, and they move to water in late winter and spring to breed.

Newly its own species

Long treated as the inland subspecies of the California newt (Taricha torosa), the Sierra Nevada populations were shown by genetic work in the 2000s to be a distinct lineage and were raised to full species. The two look nearly identical; location is the practical guide.

Poison and migration

The skin holds tetrodotoxin — toxic to eat, safe to touch briefly — advertised by the orange belly and a back-arching posture. Sierra newts often breed in flowing streams, where the female wraps her egg mass tightly around a submerged stick. Their spring migration to the breeding water crosses roads in huge numbers, killing many and prompting warning signs and volunteer crossing patrols.

Status

Least Concern but decreasing, and a California species of special concern. The pressures are drying foothill streams, ash and sediment washing in after severe wildfires, introduced crayfish, mosquitofish, and bullfrogs eating the larvae, and road mortality during the breeding migration.

Sierra Newt: common questions

What is the difference between a Sierra newt and a California newt?

For most of the 20th century they were the same species, with the coastal populations called the coast range newt and the inland ones the Sierra newt, both under Taricha torosa. Genetic studies then showed that the Sierra Nevada populations form a distinct lineage, and they were raised to full species as Taricha sierrae. In the field the two are very similar stout, warty, brown-backed, orange-bellied newts, and where they do not overlap, location is the best guide — a Taricha newt in the Sierra Nevada foothills is a Sierra newt, one in the Coast Ranges is a California newt. There are subtle average differences in eye colour and skin texture, but they are not reliable for a single animal.

Is a Sierra newt poisonous?

Yes. Its skin contains tetrodotoxin, the same potent nerve poison found in pufferfish and in its close relative the rough-skinned newt, and a Sierra newt is dangerous if eaten and can cause numbness and irritation if the toxin gets into the eyes, the mouth, or a wound. Simply picking one up with clean, intact skin on your hand is not harmful, because the toxin does not pass through skin in a dangerous amount, but you should wash your hands afterward and keep your fingers away from your face, and never let a child or pet mouth one. The toxin is why almost nothing eats these newts, apart from garter snakes that have evolved resistance.

Why do so many Sierra newts get killed on roads?

Because their breeding cycle forces a mass overland movement at a predictable time and place. Adult Sierra newts spend most of the year scattered on land in the hills, and in late winter and spring they all head for water to breed, returning with strong fidelity to the particular stream or pond where they hatched. Any road that lies between the hillsides and those breeding sites becomes a bottleneck where hundreds or thousands of slow-moving newts cross over a few weeks, and a large share are crushed by vehicles. Rain-soaked nights, when the newts move most, are the worst. Some communities in the Sierra foothills now post warning signs, organise volunteer patrols to carry newts across, or close vulnerable roads during the migration.

Can you keep a Sierra newt as a pet?

It is possible, and Taricha newts are hardy and long-lived in captivity, but it is discouraged and, in California, collecting them from the wild without a permit is illegal, with the species listed as one of special concern. If kept, they need a cool aquarium or paludarium that never warms up, with clean dechlorinated water, a land area, and small live or frozen invertebrate foods, and their tetrodotoxin skin makes them unsuitable around young children or other pets. Anyone wanting Pacific newts should seek captive-bred animals of a species that is legal to keep, and should never release captive newts into the wild.

Sources & further reading

Written by HideShark Editorial Team · reviewed by HideShark Science Desk. Published September 10, 2026. Last updated September 10, 2026.

Quick facts

Scientific name: Taricha sierrae
Diet: Worms, slugs, snails, insects and their larvae, spiders, small crustaceans, and amphibian eggs and larvae, hunted on land in the wet months and in the water during breeding, with adults eating the eggs of frogs and of other newts in the same ponds and streams
Recently recognised as its own species: The Sierra newt was long treated as an inland subspecies of the California newt, but genetic work published in the 2000s showed the coastal and Sierra populations are distinct enough to be separate species, so the Sierra Nevada animal is now Taricha sierrae
Tetrodotoxin skin: Like the other Pacific newts, the Sierra newt secretes tetrodotoxin, a potent nerve poison also found in pufferfish, and it is toxic if eaten and irritating in the eyes or a cut, though it is safe to touch briefly with clean hands, and it advertises the danger with a bright orange belly and a back-arching warning posture
Migrations across roads: In late winter and spring, adult Sierra newts move from the surrounding hills to breeding streams and ponds, often the same water they hatched in, and where roads cross these routes large numbers are killed by traffic, prompting seasonal warnings, volunteer crossing patrols, and in some places road closures
Breeding in moving water: Unlike many newts that prefer still ponds, Sierra newts often breed in slow to moderately flowing foothill streams, where the female wraps her egg mass firmly around a submerged stick or rock so it is not swept away, and the toxin in the eggs deters most predators
Fire and drought pressure: The Sierra Nevada foothills have seen severe wildfires and prolonged drought, and post-fire erosion fills breeding streams with ash and sediment while drought dries the pools, so the newt is exposed to a changing fire and water regime across much of its range
Long-lived: Sierra newts mature slowly and are long-lived for an amphibian, with wild adults reaching well over 15 years and captives sometimes 20 or more, which means a population can persist through several poor breeding years but recovers only slowly from a major loss
Range: The western foothills and lower montane zone of the Sierra Nevada in California, from around Shasta County in the north to Kern County in the south, generally between about 200 and 2000 m elevation, in oak woodland, foothill pine, chaparral, and mixed conifer forest, with the adults on land for much of the year and moving to foothill streams, ponds, and reservoirs to breed.
Conservation status: Least Concern ↓ ≈ The Sierra newt is assessed as Least Concern because it remains reasonably widespread through the western Sierra Nevada foothills, but its population is considered to be declining, and California lists it as a species of special concern. The pressures are the loss and drying of foothill streams and ponds to drought, dams, and water diversion, sediment and ash washing into breeding streams after the increasingly severe wildfires of the region, introduced predators including crayfish, mosquitofish, and bullfrogs that eat the larvae, and road mortality during the breeding migration in the wild