Common Frog (Rana temporaria), also known as the European Common Frog or European Brown Frog.
Order Anura, Family Ranidae (True Frogs), Genus Rana, Species Rana temporaria. They are typical 'true frogs' characterized by powerful hind legs, webbed feet, and smooth skin.
Species
Common Frog (Rana temporaria), also known as the European Common Frog or European Brown Frog.
Family
Order Anura, Family Ranidae (True Frogs), Genus Rana, Species Rana temporaria. They are typical 'true frogs' characterized by powerful hind legs, webbed feet, and smooth skin.
Size
Adults typically range from 6 to 9 cm (SVL). Females are generally larger than males. Weights vary between 20g and 60g. Tadpoles can reach up to 45mm before metamorphosis.
Conservation
IUCN Status: Least Concern. While widespread, populations face threats from habitat loss, garden pond destruction, pesticides, and the Ranavirus and Chytrid fungus.
Description
The classic 'garden frog' of Europe, Rana temporaria is a master of camouflage appearing in shades of bronze and earth. In the image, it sits stoically on a rock by a garden pond, its dark mask and striped back making it nearly invisible against the dappled light and lily pads.
Key Features
Look for the dark 'mask' through the eye/ear, the smooth skin, the pair of ridges (dorsolateral folds) on the back, and the often-present vertebral stripe.
Physical Description
A medium-sized frog with a robust, somewhat flattened body. It features a wide head with a distinctive dark 'mask' behind the eyes. The hind limbs are moderately long and muscular, and the snout is rounded. The eyes have horizontal pupils and golden-brown irises.
Skin Texture & Coloration
Skin is mostly smooth with subtle granular texture. Coloration is highly variable, ranging from olive-green to grey-brown or reddish-brown. The back is often marked with dark spots. A prominent light-colored stripe often runs down the spine, as seen in the provided image. The underside is white or yellow, sometimes with mottling.
Distinguishing Features
The most diagnostic feature is the dark brown 'mask' covering the eardrum (tympanum) and extending behind the eye. It also possesses distinct glandular dorsolateral folds running down each side of the back and frequently displays dark barring on the hind legs.
Habitat
Extremely versatile; found in gardens, forests, meadows, and marshes. They utilize shallow, still water like ponds (as seen in the image) for breeding, but spend much of their adult life in damp terrestrial microhabitats.
Geographic Range
Native across nearly the entire European continent, extending into western Siberia. It is found from sea level up to alpine altitudes of 2,700 meters, making it one of the most northerly distributed amphibians.
Behavior
Primarily nocturnal or crepuscular, though often active during the day during the breeding season. They are skilled jumpers and swimmers. When threatened, they often dive into water or hide in dense vegetation.
Diet & Feeding
Adults are carnivorous, eating insects, snails, slugs, and worms using a 'sit-and-wait' strategy followed by a rapid tongue strike. Tadpoles are herbivorous/detritivorous, scraping algae and decaying organic matter.
Reproduction
Explosive breeders in early spring triggered by rising temperatures. Males produce a low, 'purring' call in choruses. They use axillary amplexus (gripping the female behind the front legs) to fertilize large clumps of up to 2,000 floating eggs (frogspawn).
Vocalizations
The call is a low-frequency, repetitive 'croak' or 'purr' that sounds like a muffled motorbike or a dull vibration. It is much quieter than the calls of water frogs (Pelophylax spp.).
Life Cycle
Eggs hatch in 1-3 weeks. The tadpole stage lasts 2-4 months depending on water temperature. Metamorphosis occurs in mid-summer. Individuals reach sexual maturity at 2-3 years and can live 5-10 years in the wild.
Conservation Status
IUCN Status: Least Concern. While widespread, populations face threats from habitat loss, garden pond destruction, pesticides, and the Ranavirus and Chytrid fungus.
Toxicity & Defense
Not toxic to humans. Defense relies on crypsis (camouflage) and rapid flight into water. Their skin produces mild mucus that may be unpalatable to some predators.
Ecological Role
They are vital for pest control, consuming vast amounts of garden slugs and flies. They serve as a primary food source for herons, grass snakes, and hedgehogs.
Similar Species
Agile Frog (Rana dalmatina) which has longer legs and a more pointed snout; Common Toad (Bufo bufo) which has warty skin and no dark eye mask; and Marsh Frogs which lack the brown mask.
Observation Tips
Check garden ponds on warm, rainy nights in March for breeding activity. During summer, look in damp, shaded areas under logs or long grass during the early morning.
Handling & Safety
Safe to handle, but always wet your hands first to protect their permeable skin. Avoid handling if you have applied insect repellent or sunscreen, as these chemicals are lethal to amphibians.
Seasonal Activity
Active from February/March to October. They undergo brumation (hibernation) during winter, often buried in compost, mud, or at the bottom of oxygen-rich ponds.
Cultural Significance
A staple of European folklore and children's literature. They are viewed as friendly garden residents and are often the first introduction children have to the concept of metamorphosis.
Interesting Facts
This species can breathe through its skin while hibernating at the bottom of frozen ponds. They are capable of minor color changes to match their surroundings over several hours.