Until recently the shearwaters were devided in two genera Calonectris and Puffinus, but based on dna-analysis Penhallurick and Wink (2004) have proposed a splitting of the shearwaters into three genera: Calonectris for the large shearwaters of the Northern Atlantic, the Mediterranean and the waters around Japan, Ardenna for a group of large Southern Hemisphere breeders and Puffinus for the smaller shearwaters such as the Manx’ group, Audubon’s and Little Shearwaters. This new taxonomy is now widely accepted, but not by all and is stil subject of discussion.
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Although it is likely to breed on high, inaccessible mountains, all these islands have introduced rats, cats and dogs. Rats have been seen to at least 900 m on Kolombangara and are a potential threat to this burrow-nesting species, although cats are perhaps a greater threat.