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northern giant petrel
The northern giant petrel (''Macronectes halli''), also known as the Hall's giant petrel, is a large predatory seabird of the southern oceans. Its distribution overlaps broadly with the similar southern giant petrel, though it overall is centred slightly further north.
==Taxonomy==
The northern giant petrel along with its counterpart, the southern giant petrel, make up the ''Macronectes'' genus. They come from the Procellariiformes order, which are referred to as tube-nosed seabirds, due to their unique nose structure. All tube-noses have tubular nostrils, and all Procellariidae have the openings on top of the upper portion of the bill. Procellariiformes also have between seven and nine distinct horny plates for their bill, and petrels have one of these plates that form the hooked portion of their upper bill called their maxillary unguis. They produce a stomach oil made up of wax esters and triglycerides that is stored in the proventriculus. This can be sprayed out of their mouths as a defence against predators as well as an energy rich food source for chicks and for the adults during their long flights.〔Double, M. C. (2003)〕 Finally, they also have a salt gland that is situated above the nasal passage and helps desalinate their bodies, due to the high amount of ocean water that they imbibe. It excretes a concentrated saline solution from their nostrils.〔Ehrlich, Paul R. (1988)〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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