Shearwater Biography

Shearwaters are medium-sized long-winged seabirds. There are more than 20 species of shearwaters, a few larger ones in the genus Calonectris and many smaller species in the genus Puffinus. The Procellaria petrels were formerly believed to belong to this group, but are only distantly related based on more recent studies, while the Pseudobulweria and Lugensa "petrels" are more closely related (Bretagnolle et al., 1998; Nunn & Stanley, 1998). The genus Puffinus can be divided into a group of small species close to Calonectris and a few larger ones more distantly related to both (Austin, 1996).These birds are most common in temperate and cold waters. They are pelagic outside the breeding season.These tubenose birds fly with stiff wings and use a ?shearing? flight technique to move across wave fronts with the minimum of active flight. Some small species, like Manx Shearwater are cruciform in flight, with their long wings held directly out from their bodies.Many are long-distance migrants, p

Source: http://en.wikipedia.org/wiki/Shearwater
 

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