### Identification The Marsh Frog (*Pelophylax ridibundus*) is the undisputed heavyweight of Europe’s water frogs, reaching a robust 17cm in length. Look for a powerful, long-legged amphibian with a pointed snout and distinct dorsolateral folds—two prominent ridges running down its back. Their coloration is a camouflage masterpiece: typically olive-green to bronze-brown with irregular dark spots, often featuring a bright green stripe trailing down the spine. To distinguish it from the similar Pool Frog, check the male’s vocal sacs; in the Marsh Frog, these are a dark, smoky grey rather than white.
### Habitat & Range This sun-loving species thrives in large, permanent bodies of water across Europe and Central Asia. You’ll find them basking on the muddy banks of lakes, slow-moving rivers, and drainage canals. Unlike their more terrestrial cousins, they rarely venture far from the water’s edge, preferring open areas with plenty of sunlight and floating vegetation like water lilies.
### Behaviour Marsh Frogs are famously wary. Approach a pond, and you’ll hear a series of "plops" as they dive for cover. They are most active during the day, soaking up UV rays to fuel their metabolism. During the breeding season (April–June), the air fills with their signature call—a loud, staccato cackling that sounds remarkably like human laughter, earning them their scientific name *ridibundus*.
### Diet An opportunistic ambush predator, the Marsh Frog has a "if it fits, I eat it" policy. While they primarily consume dragonflies, beetles, and snails, large adults are formidable enough to take down small vertebrates, including fish, newts, fledging birds, and even smaller frogs of their own kind.
### Fascinating Fact The Marsh Frog is a biological "parent" to a genetic anomaly. When it breeds with the smaller Pool Frog (*P. lessonae*), they produce a fertile hybrid known as the Edible Frog (*P. esculentus*). This hybrid can then backcross with the Marsh Frog to maintain its population, a rare and complex phenomenon known as hybridogenesis!