Common Frog

Rana temporaria

Last updated: February 7, 2021
Verified by: AZ Animals Staff

Found throughout the European continent!

Common Frog Scientific Classification

Kingdom
Animalia
Phylum
Chordata
Class
Amphibia
Order
Anura
Family
Ranidae
Genus
Rana
Scientific Name
Rana temporaria

Read our Complete Guide to Classification of Animals.

Common Frog Conservation Status

Common Frog Locations

Common Frog Locations

Common Frog Facts

Main Prey
Insects, Worms, Snails
Fun Fact
Found throughout the European continent!
Distinctive Feature
Short back legs and webbed toes
Habitat
Forests, rivers and marshes
Diet
Carnivore
Lifestyle
  • Solitary
Favorite Food
Insects
Type
Amphibian
Average Clutch Size
1500
Slogan
Found throughout the European continent!

Common Frog Physical Characteristics

Color
  • Brown
  • Grey
  • Black
  • Green
Skin Type
Permeable
Top Speed
5 mph
Lifespan
5 - 10 years
Weight
20g - 80g (0.7oz - 2.8oz)
Length
6cm - 10cm (2.4in - 4in)

This post may contain affiliate links to our partners like Chewy, Amazon, and others. Purchasing through these helps us further the A-Z Animals mission to educate about the world's species..

View all of the Common Frog images!



With its smooth, moist skin, long, sticky tongue, and elongated hind legs, the common frog is one of the most recognizable species of frogs on the planet.

Native to Europe, common frogs are found from Great Britain through Central Russia. Although the species is not considered endangered, its population numbers are believed to be declining. In Great Britain and Ireland, the common frog is protected by law from trade or sale, so this amphibian isn’t meant to be kept as a pet. Like other frogs, common frogs have a distinct lifecycle featuring three stages of development.

5 Incredible Common Frog Facts!

  • Chameleons: The common frog can lighten and darken its skin to blend in with its surroundings better, a strategy they use to hide from predators.
  • Hibernators: During the coldest part of the winter, common frogs hibernate. In the northernmost reaches of their range, they can become trapped under ice for up to nine months but emerge unscathed with the thaw.
  • Insect Lovers: Adult common frogs are carnivores, primarily subsisting off worms and other insects. In fact, they can detect the presence of a worm through their sense of smell.
  • Protected: It is believed that common frog populations are declining – mostly because of human activity. The species is protected by law in Ireland and the UK, where they can’t be bought or sold.
  • Varied Rate of Development: Like most amphibians, the rate at which the common frog develops is strongly influenced by temperature. Therefore, common frogs in warmer places develop faster than ones in colder areas.

Common Frog Scientific Name

The scientific name for the common frog is Rana temporaria. These amphibians belong to the class Amphibia, the order Anura, the family Ranidae and the genus Rana. As members of the Ranidae family, common frogs are considered true frogs.

Many different names are used for these frogs. They are also known as grass frogs, russet frogs, European common frogs, and European common brown frogs.

Common Frog Appearance

These frogs have corpulent bodies, and they grow to an average size of 2.8 to 3.9 inches long. On average, they weigh around 0.80 ounces, so they are tiny and lightweight. They have smooth, moist skin, and their coloring and markings vary. The underlying skin may be greenish, gray, yellowish, red, or brown in appearance. Anywhere from a small smattering to a large concentration of markings may also appear, and they are typically reddish-brown or black in color. The underbelly side is usually white or yellow. Common frogs typically have stripes on their hind legs, and a “mask” appears behind their eyes and eardrums.

These frogs have a unique face. They possess brown, oval-shaped eyes with transparent, horizontal pupils. A transparent inner eyelid protects their eyes while they are underwater.



These frogs exhibit a small amount of sexual dimorphism. Females are usually a bit larger than males. During the mating season, the male’s throat may turn completely white. Males also have hard swellings, known as nuptial pads, on the first digits of their forelegs. These swellings come in handy during mating because the male uses them to hold himself in the correct position atop the female.

Common Frog on large green lilly pad

davemhuntphotography/Shutterstock.com

Common Frog Behavior

Outside of the mating season, these frogs are solitary creatures. While preparing for hibernation, these frogs will consume large amounts of insects, worms, and slugs. They hibernate during the coldest part of the winter, typically under rocks, inside compost heaps, or even underwater in the mud and vegetation. In freezing northern climates, the common frog may even become trapped beneath the ice for as long as nine months at a time. They are able to take in moisture through their skin, which helps them make it through. Although they do hibernate, these frogs aren’t strict about it, often venturing out opportunistically to forage for food. This frog has a long, sticky tongue, and it darts it out quickly to snare various insects.

The primary call of the common frog is a croaking sound. Common frogs are most active during the nighttime.

Common Frog Habitat

A native of Europe, these frogs are primarily found from Great Britain through central Russia. They are found as far north as Scandinavia, as far east as the Ural Mountains, and as far west as Ireland, and they are also found in parts of Asia through Japan. These amphibians prefer habitats with dark, shady areas and damp conditions, so they are primarily found in ponds, marshes, and areas of long grass.

Common Frog Diet

As tadpoles, these frogs are herbivores, subsisting mostly off of algae and other decaying plant matter. Adult frogs are considered carnivores because they mostly consume insects, insect larvae, woodlice, snails, spiders, and worms. In fact, common frogs can detect the presence of worms through smell alone, so they are very attuned to locating and consuming them.

Common Frog Predators and Threats

The most common predators faced by these frog tadpoles include beetles, birds, fish, and dragonfly larvae. Common predators of adult frogs include birds of prey, gulls, storks, herons, ducks, crows, snakes, and badgers. Housecats also target common frogs but usually do them little harm.

Although this frog is listed as Least Concern by the IUCN Red List, its population numbers are believed to be declining. Human activity is mostly to blame, especially alterations made to the land for real estate development. Since this species thrives in ponds, a decline in the number of ponds in the UK is also likely to blame. Over the last 100 years or so, the number of ponds in the country dropped by one-third to around 500,000 or so. With around one-third of its favorite habitats gone, it should come as no surprise that these creatures are struggling to survive.

Work is being done to protect these frogs, fortunately. The species is protected by law in Ireland and the UK from trade or sale. Therefore, you can’t go to a pet shop to buy a common frog. This frog shouldn’t be kept as a pet at all. There are many other less vulnerable frog species, and choosing one of them to keep as a pet is the best option. Other species are easier to care for; the common frog can be difficult to care for effectively in captivity.
The common frog is also susceptible to many diseases, including the ranavirus.

Common Frog Reproduction, Babies and Lifespan

The common frog has an average lifespan of five to 10 years. Its lifespan may vary depending on where it lives and whether it is kept in captivity. During its lifetime, this species undergoes a unique life cycle consisting of three primary stages: the aquatic larva stage, the terrestrial juvenile stage, and the adult stage. Early in the life cycle, an embryo develops inside an egg that is floating in the water.

As an early tadpole, the creature forms a developing mouth and attaches itself to substrates. Next, as a late tadpole, the common frog develops a mouth with rasping teeth, and skin grows over its gills. At around 16 weeks of age, the hind legs form; they are followed shortly after by the front legs. The tail begins to shorten; when it is fully absorbed, the adult frog can leave the water for the first time. The life cycle is now complete.

These frogs typically breed during the later spring or whenever the water temperature reaches 57 degrees Fahrenheit. Around that time, the frog’s pituitary gland is stimulated by changes to things like the length of daytime, temperature, and average rainfall and begins to produce sex hormones. Males develop sperm, and females develop eggs. Males’ nuptial pads become swollen and may become pigmented too.

Male frogs compete for females in ponds through “choirs” of croaks. Female frogs are drawn to males who have the longest and loudest croaks, so males try to make as much noise as they can. Eventually, the female enters the pond, and a male frog climbs on top of her. He grasps onto the female under her forelegs with his nuptial pads, and he may have to kick away other males who are competing for the female’s attention. The male remains in place until the female lays her eggs – she may lay anywhere from 1,000 to 4,000 of them, and they are black with a clear, jelly capsule. As the eggs are released, the male sprays sperm over them.

It takes around three months for tadpoles to metamorphose completely. When they initially emerge, they are entirely black in color. After developing hind legs around 16 weeks of age and losing their tail, they emerge as full adults. Adult frogs reach sexual maturity around two to three years of age.

Common Frog Population

Global population estimates for these frogs are not available. The species is listed as Least Concern by the IUCN, but its populations are believed to be declining across Europe. In an effort to protect them, laws are in place preventing their sale or trade. As a result, this is not a good frog to keep as a pet.

Common Frog at the Zoo

You can find these frogs at zoos around the world. Currently, the Moscow Zoo and the Ahtari Zoo – a zoo that is located in Finland – have common frogs on display. Visiting a common frog at the zoo is a great way to learn more about the species.

View all 157 animals that start with C

About the Author

AZ Animals is a growing team of animals experts, researchers, farmers, conservationists, writers, editors, and -- of course -- pet owners who have come together to help you better understand the animal kingdom and how we interact.

Common Frog FAQs (Frequently Asked Questions) 

Are Common Frogs herbivores, carnivores, or omnivores?

As tadpoles, common frogs are herbivores, surviving mostly off algae and other plant materials. When they become adult frogs, their diets consist mostly of insects, insect larvae, spiders, woodlice, snails, and worms.

What Kingdom do Common Frogs belong to?

Common Frogs belong to the Kingdom Animalia.

What class do Common Frogs belong to?

Common Frogs belong to the class Amphibia.

What phylum to Common Frogs belong to?

Common Frogs belong to the phylum Chordata.

What family do Common Frogs belong to?

Common Frogs belong to the family Ranidae.

What order do Common Frogs belong to?

Common Frogs belong to the order Anura.

What genus do Common Frogs belong to?

Common Frogs belong to the genus Rana.

What type of covering do Common Frogs have?

Common Frogs are covered in permeable skin.

In what type of habitat do Common Frogs live?

Common Frogs live in forests, rivers, and marshes.

What is the main prey for Common Frogs?

Common Frogs prey on insects, worms, and snails.

What are some predators of Common Frogs?

Predators of Common Frogs include foxes, snakes, and birds.

What are some distinguishing features of Common Frogs?

Common Frogs have short back legs and webbed toes.

How many eggs do Common Frogs lay?

Common Frogs typically lay 1,500 eggs.

What is an interesting fact about Common Frogs?

Common Frogs are found throughout the European continent!

What is the lifespan of a Common Frog?

Common Frogs can live for 5 to 10 years.

How fast is a Common Frog?

A Common Frog can travel at speeds of up to 5 miles per hour.

Are common frogs endangered?

No. The IUCN Red List classifies the common frog as a species of Least Concern, which means that it is not seriously endangered. However, common frog populations are believed to be declining across Europe – mostly because of human activities, including the elimination of thousands of ponds. Laws in the UK and Ireland prevent the sale and trade of the common frog.

Are common frogs poisonous?

No. Common frogs aren’t poisonous. The primary way they protect themselves is by altering their skin color to blend in with their surroundings. This camouflaging technique is one of its most important defense mechanisms.

Do common frogs live in the water?

Common frogs spend a lot of time in the water, but they typically live close to bodies of water rather than within them permanently. Therefore, you are likely to find common frogs near ponds, lakes, and even large puddles. They also often live in marshes and areas of tall grass.

What do common frogs look like?

The common frog measures 2.8 to 3.9 inches long and weighs an average of 0.8 ounces. Its skin may be greenish, yellowish, red, gray, or brown, and it is usually overlaid by a few or many spots that are reddish or black in color. These frogs have long, striped hind legs and “masks” over their eyes and eardrums. Males have nuptial pads, hard swellings on their forelegs’ first digits, and are usually smaller than females.

What is the scientific name for the common frog?

The scientific name for the common frog is Rana temporaria. Other common frog names include grass frog, russet frog, European brown frog, and European common frog.

Is the common frog a good pet to have?

No. In fact, it is against the law to trade or sell the common frog in the UK and Ireland. Additionally, it is not easy to care for this frog at home, so it is better to find a different frog species to keep as a pet.

How do Common Frogs have babies?

Common Frogs lay eggs.

How to say Common Frog in ...
Bulgarian
Планинска жаба
Catalan
Granota roja
Czech
Skokan hnědý
Danish
Butsnudet frø
German
Grasfrosch
English
Common Frog
Spanish
Rana temporaria
Estonian
Rohukonn
Finnish
Sammakko
French
Grenouille rousse
Hungarian
Gyepi béka
Italian
Rana temporaria
Japanese
ヨーロッパアカガエル
Dutch
Bruine kikker
English
Vanlig frosk
Polish
Żaba trawna
Swedish
Vanlig groda
Chinese
林蛙
Sources
  1. Discover Wildlife, Available here: https://www.discoverwildlife.com/animal-facts/amphibians/facts-about-common-frogs/
  2. Amphibian and Reptile Conservation, Available here: https://www.arc-trust.org/common-frog
  3. Ahtari Zoo, Available here: https://www.ahtarizoo.fi/index.php/en/zoo/animals/common-frog
  4. Frog Life, Available here: https://www.froglife.org/info-advice/amphibians-and-reptiles/common-frog-2/
  5. Britannica, Available here: https://www.britannica.com/animal/common-frog

Newly Added Animals

A Blacktip Reef Shark
Blacktip Reef Shark

They move in and out of mangrove swamps with the tides.

A Caribbean Reef Shark
Caribbean Reef Shark

These sharks are a big part of ecotoursim in the Caribbean.

A Megatherium
Megatherium

Megatherium probably used its lips more than its tongue when feeling for choice leaves in the treetops.

Most Recently Updated Animals

A Polar Bear
Polar Bear

Could be extinct within the next 30 years!

A Siberian Tiger
Siberian Tiger

Also known as the Amur tiger!

A Vampire Squid
Vampire Squid

Each of its eight arms has spines, though they use two filaments to eat.