Two-year search finds no remaining Corncrakes in Brittany
Hundreds of listening hours at 41 selected sites and passive recorders failed to detect a singing bird during 2025 or 2026.
A two-year search for Corncrakes in Brittany has failed to detect a single singing bird, leading LPO Bretagne to conclude that the species' regional breeding population has disappeared.
Surveyors spent hundreds of hours listening at former strongholds during the 2025 and 2026 breeding seasons. Fifteen volunteers and staff covered 41 selected points, with each location visited at least three times between April and June.
The sites included wet grasslands along the River Vilaine, areas east of the Rance in Ille-et-Vilaine and Guissény in northern Finistère. They were chosen using records made since 2000 and the availability of habitat capable of supporting the secretive rail.
Passive AudioMoth recorders were also deployed at key marshes. Recordings were screened using acoustic-recognition software and potential detections checked manually, but no Corncrake calls were confirmed in either year.
The conclusion refers to the loss of a breeding population, rather than proof that no Corncrake will ever occur in the region. Migrants can still appear away from nesting areas, and an isolated bird could pass undetected. The most recent possible breeding record was at Guissény in 2023, while later observations have included birds thought to be on migration.
“These two years of surveys appear to confirm that the species has disappeared from Brittany.”
LPO Bretagne, translated from French
LPO Bretagne reviewed 138 historical reports and retained 84 that met its criteria. The archive shows a former breeding presence extending back through the twentieth century, with important areas around Redon, Rieux and the Vilaine valley.
Corncrakes require tall, dense vegetation in which to call, nest and rear their young. The loss and fragmentation of wet meadows, together with early and rapid mowing, have driven declines across much of western Europe. Birds can be killed when cutting moves from the outside of a field towards its centre, leaving them progressively trapped.
The Breton result reflects a wider national crisis. LPO Bretagne said provisional figures for 2026 suggested that only 60–80 singing males remained across France.
The survey team considers the return of a stable breeding population unlikely without suitable habitat and nearby source populations. However, maintaining late-cut, structurally varied wet grassland would benefit a much wider community of declining farmland and wetland wildlife.
2 Sep 2026
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