Shearwaters eat small crustaceans, plankton, squid, fish, and in some cases, floating scraps.
Oodles more information at the related link listed below:
Most probably a Yelkouan Shearwater. Also known as a Mediterranean Shearwater
Heinroth's Shearwater was created in 1919.
Little Shearwater was created in 1838.
Manx Shearwater was created in 1764.
Shearwater Aircraft was created in 2009.
Bryan's Shearwater was created in 2011.
Townsend's Shearwater was created in 1890.
Christmas Shearwater was created in 1877.
Shearwater - album - was created in 1972.
Balearic Shearwater was created in 1921.
Scarlett's Shearwater was created in 1994.
Great Shearwater was created in 1818.