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Marsh frog & tree frog choruses

Marsh frog calling with both vocal sacs inflated
Marsh frog. Photo: Calimo, CC BY-SA 3.0

Marsh frog (Pelophylax ridibundus), Perez's/edible frogs, European tree frog (Hyla arborea), Mediterranean tree frog (H. meridionalis), natterjack. Camargue, Brenne, Marais poitevin, Landes, France.

Best time: 25 Apr – 10 Jun (April to June). Where: Marais du Vigueirat / Camargue ditches, Brenne ponds (Chérine area), Marais poitevin (Coulon) (France). Time of day: Marsh frogs call by day but the full chorus is from dusk to 02:00.

Open it in the interactive calendarSunrise and sunset listening times for the day you pick, and the map.

When is the best time?

Peak: 25 Apr – 10 Jun. Late April to early June, warm nights

Active from 1 Apr to 15 Jul (April to July) in a typical year.

Time of day

Marsh frogs call by day but the full chorus is from dusk to 02:00; tree frogs and natterjacks start about an hour after sunset and peak between 23:00 and 01:00 on warm nights.

What will you hear?

Wall-to-wall marsh frog laughter from the Camargue ditches, ratcheting tree frogs from Brenne ponds, and natterjacks rolling across the Landes dune slacks.

Binoculars?

No binoculars needed. Chorus from the ditch edge; a torch finds tree frogs, nothing else needed.

Where to go

How to go on your own, and what it costs

Roadside ditches and ponds: the Camargue D36/D37 verges, Brenne roadside ponds around Chérine, the Marais poitevin canal paths at Coulon (flat-boat hire optional), the Courant d'Huchet dune paths. All free; stay off private banks.

Cost: Free; Marais poitevin boat hire optional (check current prices).

Field-recording notes

SPLs at the ditch edge are high — back off 10–20 m for balance and pad if going close. Introduced marsh frogs now dominate much of southern France and drown out native species; the Brenne still has clean tree frog choruses. Everything here is protected — no capture.

Sources

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