Calonectris diomedea
Exploitation has decreased in importance as a threat. Other threats include the ingestion of plastic flotsam. Once swallowed, plastic can cause a general decline in the fitness of the bird, or in some cases lodge in the gut and cause a blockage, leading to death by starvation. It can also be picked up by foraging adults and fed to chicks, stunting their development and reducing the chances of successfully fledging. Procellariids are also vulnerable to marine pollution, as well as oil spills. Some species, such as Barau's petrel, Newell's shearwater and Cory's shearwater, which nest high up on large developed islands, are victims of light pollution. Fledging chicks are attracted to streetlights and may then be unable to reach the sea. An estimated 20 to 40 percent of fledging Barau's petrels and 45 to 60 percent of fledging Cory's shearwater are attracted to the streetlights on Réunion and Tenerife, respectively.