Cory's shearwater
The Cape Verde shearwater "C. edwardsii" (Oustalet, 1883) was once considered a subspecies of Cory's shearwater but has recently been split off as a separate species . It is endemic to the Cape Verde Islands. It has an all dark, slim bill, and darker head and upperparts than Cory's. The flight has been described as rather more typically shearwater-like than the Cory's, with stiffer and more rapid wing beats.