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This list of Oregon birds lists wild bird species found in the U.S. state of Oregon. There are between four and five hundred species regularly known to frequent the state, with another hundred or more that are occasionally or rarely seen.〔(【引用サイトリンク】title=Official Checklist of Oregon Birds )〕 Bird counts often change depending on factors such as the number and training of the observers, as well as opinions about what constitutes an officially recognized subspecies. Though northern climes typically do not support as many species as southerly locations, Oregon is fifth in bird species diversity in the United States, behind Florida, New Mexico, Texas and California.〔 This amount of diversity is attributable to Oregon's numerous distinctive ecoregions and relatively mild winter weather, which make it an important wintering ground for migratory bird species, especially waterfowl, on the Pacific Flyway. Another result of the state's varying ecology is the 120 Important Bird Areas, such as the Jackson Bottom Wetlands Preserve, that are recognized as important conservation sites for birds.〔(【引用サイトリンク】title=Important Bird Areas )〕 Many of these dedicated wildlife refuges have become meccas for birding enthusiasts, and Oregon has participated in formally organized birding activities such as the Christmas Bird Count since the early 1900s. Other areas are closed to human access but are very popular with birds, such as Oregon Islands National Wildlife Refuge which spans some of the Oregon Coast. As an important U.S. region of bird diversity, Oregon has faced some serious challenges in protecting endangered and threatened avian species. In addition to high profile, threatened species such as the northern spotted owl and snowy plover, even many common species—including Oregon's state bird, the western meadowlark—have declined considerably due to hunting, habitat loss and other factors. __NOTOC__ ==Order Anseriformes== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「List of birds of Oregon」の詳細全文を読む スポンサード リンク
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