Compensation measures

Combating the predation of seabirds by black crows

Objectives and methodology

This measure, implemented since 2012, aims to limit predation on seabird eggs laid by crows that tend to specialize on the Black Guillemot and 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 has resulted in an increase in the number of breeding pairs. All high-stake species reached an all-time high in numbers for Cape Frehel over the period monitored.

  • Black-legged Kittiwake: the breeding population recorded is at its highest level ever recorded with 305 breeding pairs (an increase of 87 pairs in 2019). The number of breeding pairs has been increasing almost constantly since the first crow control operations.
  • Guillemot de Troïl: The 2019 results are very encouraging, with more than 500 couples counted.
  • Penguin Torda: The demographic trend gives hope for a population recovery. The 2019 population surveyed on Cap Fréhel therefore stands at 52-55 breeding pairs.
  • Crested Cormorants: Juvenile production has reached a record high since the start of juvenile production monitoring (average of 1.88 juveniles per breeding pair).

An important predation by the Peregrine Falcon is to be underlined. 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.


Planning and Status


Measure put in place

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

All compensation measures

Follow-up actions

Reduction measures

Accompanying measures