1. wild pigeon of western North America; often mistaken for the now extinct passenger pigeon. 
   北美西部的野鸽；常被当作现已灭绝的候鸽。
2. It was extinction by dilution, and to the ornithologists it was just as tragic as the more dramatic demise of the passenger pigeon or the Carolina parakeet. 
   混种将导致野火鸡灭绝；对鸟类学家来说，这和北美候鸽或卡罗来纳长尾小鹦鹉大批大批地死亡同样悲惨。

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• 1. passenger pigeon
  passenger list 旅客名单...passenger pigeon 候鸽...passenger 乘客
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• 2. pigeon
  passenger...pigeon（候鸽）...若直接告诉您，stool
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