Compensation measures

Fight against predation of seabirds by carrion crows

Objectives and methodology

This measure, implemented since 2012, aims to limit predation on seabird clutches by crows tending to specialize on the Common Guillemot and the Black-legged Kittiwake. The Syndicat Mixte Grand Site Cap d'Erquy Cap Fréhel, an experienced operator of this practice, has been implementing this compensation measure on behalf of Ailes Marines since 2019.

This measure allowed an increase in the number of nesting pairs. All high-stakes species reached a historic record number for Cap Fréhel over the period monitored.

  • Black-legged kittiwake: the breeding population recorded is at the highest historical level recorded with 305 breeding pairs (increase of 87 pairs in 2019). The number has been increasing almost constantly since the first crow regulation operations.
  • Common Guillemot: The 2019 results are very encouraging, with more than 500 pairs recorded.
  • Torda Penguin: The demographic trend gives hope for a population recovery. The 2019 population recorded on Cap Fréhel therefore stands at 52-55 breeding pairs.
  • Great crested cormorants: The production of young has reached a record result since the start of monitoring of young production (average of 1.88 young per breeding pair).

Significant predation by the Peregrine Falcon should be noted. The implementation of this measure is a success and is bearing fruit. The campaign was carried out in April and June 2020.

Location of actions

The measure is implemented on land, on the cliffs of Cap Fréhel.


Schedule and Status


Measure implemented

This compensatory measure is put in place before the start of the work, then extends annually for a period of 10 years then, if necessary, every 2 years until the end of the life of the project.

All compensation measures

Follow-up measures

Reduction measures

Accompanying measures