Calonectris diomedea has a breeding population size of 281000-300000 pairs and a breeding range size of 8200 square kilometres in the EU27. The breeding population trend in the EU27 is Stable in the short term and Unknown in the long term.

Calonectris diomedea is considered to comprise of two distinct species, C. diomedea and C. borealis, according to the current BirdLife International taxonomy. Therefore, the EU population status was assessed at the level of C. diomedea and C. borealis.

Scopoli's Shearwater, Calonectris diomedea, is a species of seabird found in unvegetated or sparsely vegetated land ecosystems. Calonectris diomedea has a breeding population size of 29200-46200 pairs in the EU27. The breeding population trend in the EU27 is Decreasing in the short term and Decreasing in the long term.

The EU population status of Calonectris diomedea was assessed as Secure, because the species does not meet any of the IUCN Red List criteria for threatened or Near Threatened, or the criteria for Depleted or Declining (the EU27 population or range has not declined by 20% or more since 1980).

Cory's Shearwater, Calonectris borealis, is a species of seabird found in unvegetated or sparsely vegetated land ecosystems. Calonectris borealis has a breeding population size of 252000-254000 pairs in the EU27. The breeding population trend in the EU27 is Uncertain in the short term and Unknown in the long term.

The EU population status for Calonectris borealis is Unknown, as the data reported were not sufficient to assess the population status of the species.