This species breeds on various islands in the Mediterranean Sea. It is a large brownish shearwater with mostly white underparts and rather large pale bill. Its Atlantic version is called Cory's Shearwater (Calonectris borealis). Until around 2012, they were considered two subspecies.
Top: Aegean Sea between Patmos and Mykonos, Greece, 25 September 2012
Left, Middle & Right: Aegean Sea near Athens, Greece, 28 September 2012