Marsh Frog (Pelophylax ridibundus) lives in freshwater wetlands across Europe and parts of western Asia. It feeds on insects and crustaceans. Its conservation status is Least Concern.
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The marsh frog's family tree stretches back millions of years: the marsh frog complex first appeared about 3.5 million years ago in the Late Pliocene, and its closest cousin, the Cretan frog, split off roughly 5.2 million years ago during the Early Pliocene. Fossil bones from France, Germany and Romania show that Pelophylax ancestors were already roaming Europe over 33.9 million years ago, while the oldest confirmed marsh-frog fossils from Armenia date between 5.3 and 3.6 million years ago.
At up to 15 cm (5.9 in) from snout to vent, the marsh frog is the biggest frog in most of its range, but human pressure can shrink it. Studies of a Turkish population show that commercial harvesting caused average body sizes to drop between 1999 and 2008.
Marsh frogs can survive a frozen winter by enduring ice formation for more than a day, but they have a hard limit: if over 58 % of their body water turns to ice, they die. This extreme freeze tolerance, without the protective blood chemistry of related frogs, highlights a unique survival strategy that lets them hibernate underwater in cold climates.
The marsh frog's range spans most of Europe and stretches east to Kazakhstan, Iran and Afghanistan, with an isolated relict group in southern Saudi Arabia's Hadhramaut. Humans have also spread it far beyond its native lands, establishing populations in Switzerland, Belgium, Spain, Sardinia, Russia's Kamchatka Peninsula, the United Kingdom and Saudi Arabia's Al-Kharj region, showing how adaptable the species is to new environments.
Unlike most amphibians, marsh frogs can live and even breed in salty water. They have been recorded nesting in brackish pools along the Caspian and Black Sea coasts.
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In the misty dawn of a wetland, the marsh frog emerges, its slender form gliding effortlessly across the water's surface, as if borne on the very fabric of the marsh itself. With a sinuous leap, it launches into the air, its long legs unfolding like a slow-motion ballet, a testament to the exquisite adaptability of this most resilient of creatures. As it disappears into the reeds, its deep, throaty call echoes through the mist, a primal serenade that has resonated across the marshes of Europe for millennia.
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