8 COMMON Amphibians in Idaho (ID Guide)
Are you wondering what amphibians you can find in Idaho?
This is a great question! Although amphibians are widespread, they can be challenging to locate. Most amphibians, including frogs, toads, and salamanders, are secretive and shy. But in my opinion, looking for amphibians is a really fun experience!
Below you will find a list of the most COMMON and interesting amphibians that live in Idaho. In addition, you will find detailed pictures, along with range maps for each species to help with your identification!
- RELATED: 7 Common Reptiles in Idaho (W/Pics!)
8 Types of Amphibians in Idaho:
#1. American Bullfrog
- Lithobates catesbeianus
Identifying Characteristics:
- Adult body lengths range from 3.6 to 6 inches.
- Coloration is typically olive green, with some individuals having gray or brown spots.
- Fully webbed back feet.
The American Bullfrog is one of the largest amphibians in Idaho!
Believe it or not, they can grow to weigh as much as 1.5 pounds (.7 kg). Bullfrogs can be found in permanent bodies of water, including swamps, ponds, and lakes.
American Bullfrog Range Map
Green: native range. Red: introduced range.
Bullfrogs eat just about anything they can fit in their mouth and swallow! The list of prey includes other frogs, fish, turtles, small birds, bats, rodents, insects, crustaceans, and worms. I have personally witnessed one even trying to eat a baby duck!
- RELATED: The COMPLETE List of Frogs in Idaho (6 Species)
They are named for their deep call, which is thought to sound like a bull bellowing.
#2. Northern Leopard Frog
- Lithobates pipiens
Identifying Characteristics:
- Adults range from 2 to 4.5 inches long.
- Smooth skin is green, brown, or yellow-green with large dark spots.
- Lighter-colored raised ridges extend down the length of the back.
You can spot these amphibians in Idaho near slow-moving bodies of water with lots of vegetation. Northern Leopard Frogs are easy to see in or near ponds, lakes, streams, and marshes. I love how bright green most individuals appear!
Northern Leopard Frog Range Map
Due to their fairly large size, these amphibians eat various foods, including worms, crickets, flies, small frogs, snakes, and birds. In one study, a bat was even observed being eaten!
During the spring breeding season, the males will float in shallow pools emitting a low call thought to sound like snoring. However, the Northern Leopard Frog may also make a high, loud, screaming call if captured or startled.
Northern Leopard Frog populations are declining in many areas, and the cause is not exactly known. It’s thought to be a combination of habitat loss, drought, introduced fish, environmental contaminants, and disease.
#3. Western Chorus Frog
- Pseudacris triseriata
Identifying Characteristics:
- Adult body length up to 1.6 inches long.
- Smooth skin with color that varies from gray to green or brown.
- Dark brown or gray stripes run down the back, a dark stripe from the snout through the eye, and a white stripe on the upper lip.
- Also called the Midland Chorus Frog.
In southern Idaho, look for these amphibians in woodland ponds, marshes, swamps, meadows, and grassy pools.
Western Chorus Frog Range Map
Credit: U.S. Geological Survey, Department of the Interior/USGS
For breeding, they try to find bodies of water without fish, including flooded fields, beaver ponds, roadside ditches, marshes, and shallow lakes and ponds. The female attaches small masses of eggs to underwater vegetation.
Western Chorus Frogs are secretive and nocturnal, so they can be hard to spot. Your best way to locate one is to use your ears. Listen for a unique call that is rapid and relatively short and sounds a bit like running your finger over the teeth of a comb. PRESS PLAY BELOW.
#4. Boreal Chorus Frog
- Pseudacris maculata
Identifying Characteristics:
- Adults range from 1 to 1.5 inches long.
- Coloration is brown, olive green, or tan, with three dark stripes down the back that are sometimes broken into blotches.
- Prominent black stripe on each side from nostril, through the eye, and down the sides to the groin.
- Looks very similar to the Western Chorus Frog. Boreal Chorus Frogs are distinguished by having shorter legs.
While the Boreal Chorus Frog is a common amphibian in Idaho, they are rarely seen. They’re small and secretive, inhabiting moist meadows and forests near wetlands.
Boreal Chorus Frog Range Map
Credit: U.S. Geological Survey, Department of the Interior/USGS
These amphibians breed in shallow temporary ponds and pools such as flooded fields and roadside ditches. They require waters free of fish; otherwise, predators would eat most of their eggs and tadpoles!
Males produce a loud chorus of calls at breeding sites, which are easy to identify.
The sound has been compared to someone running a finger over the teeth of a comb (“reeeek“). You’re most likely to hear the calls in the late afternoon or evening.
#5. Pacific Treefrog
- Pseudacris regilla
Identifying Characteristics:
- Adults can reach 2 inches long, with the males typically being smaller.
- Most are green or brown with pale white undersides, but some are reddish, gray, cream, or black.
- Dark mask across the eyes to the shoulders and uniformly bumpy skin.
These amphibians can be found in a wide range of elevations in Idaho, ranging from sea level to 10,000 feet (3,050 m)!
Pacific Treefrog Range Map
Look for Pacific Treefrogs in woodlands and meadows. Interestingly, these amphibians spend most of their time on the ground despite being a treefrog. They even hide from predators in underground burrows!
Also called the Pacific Chorus Frog, this species can be heard during the spring. Their mating call is a two-part call that sounds like “kreck-ek” or “rib-bit.“
#6. Western Toad
- Anaxyrus boreas
Identifying Characteristics:
- Adult length is 2-5 inches.
- Coloring can range from yellowish, tan, gray, or green with a pale stripe along the back. The Western Toad also has dark blotches with rust-colored edges and warts.
- Males have smoother, less blotchy skin than females.
As its name suggests, the Western Toad lives in the western part of the continent. It has a wide range of habitats, including desert streams and springs, forests, lakes and rivers, and backyard gardens with pools nearby.
Western Toad Range Map:
Unlike most other toads, Western Toads don’t often hop!
Instead, they walk, picking up 1 or 2 legs at a time. You can see this unique movement below!
#7. Woodhouse’s Toad
- Anaxyrus woodhousii
Identifying Characteristics:
- Adult length is 2 ½-4 inches.
- Coloring ranges from gray to yellowish or olive green.
- The belly is light tan or buff, with very few dark spots on the chest.
Woodhouse’s Toads are adaptable to many environments, including grasslands, deserts, floodplains, and developed areas. Interestingly, individuals that live in suburban areas will wait under street lamps to catch and eat insects attracted to the light.
Woodhouse’s Toad Range Map:
The most striking feature of these amphibians is their shape – they are round and stout, with short legs that look too small to support their bodies!
Woodhouse’s Toads have a very short call that resembles a distressed sheep’s bleat.
#8. Western Tiger Salamander
- Ambystoma mavortium
Identifying Characteristics
- Adults range from 3 to 6.5 inches in length.
- Their coloring is greenish-yellow with black markings, ranging from large spots and stripes to small irregular shapes on the head, back, and tail.
- This species has a thick body and neck and a short snout.
Western Tiger Salamanders are secretive and spend much of their time underground. You’re most likely to see these amphibians moving about and foraging on rainy nights. Their favorite hiding spots are burrows, which they can make themselves or borrow from other animals.
Interestingly, Western Tiger Salamanders have four distinct morphs as adults. Scientists classify them by whether they are aquatic or terrestrial and what they eat. For example, a typical Western Tiger Salamander eats insects and frogs, breathes above water, and spends time on land.
However, there is a terrestrial morph that cannibalizes other Western Tiger Salamanders! In addition, there are cannibalistic and non-cannibalistic AQUATIC morphs that have gills and breathe underwater.
The aquatic individuals are called paedomorphs, and while they are mature and able to reproduce normally, they retain a lot of the features of larval Western Tiger Salamanders. The most obvious feature is their frilly, long gills!
What types of amphibians in Idaho have you seen?
Let us know in the comments!
