The passenger pigeon is extinct.

这座火山是座死火山。

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Other archaeologists have criticized those conclusions on the grounds that passenger pigeon bones would not be likely to be preserved.

其他考古学家批评了这些结论，因为旅鸽的骨头不太可能被保存下来。

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Pigeon fanciers from other places or foreign countries can deliver the pigeon to Yangzhou Long-distance Passenger-transport Bus Station or Yangzhou Railway Station.

外地及境外鸽友可将赛鸽直接发至扬州长途客运站或火车站。

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Such a wide scope is impressive, and Mr Ford's enthusiasm for more obscure factual details, such as the decline of the passenger pigeon, shines through.

ECONOMIST: Audacity and elegy

The effort, echoing "Jurassic Park", won't bring back dinosaurs -- their DNA didn't survive the tens of millions of years since they disappeared -- but aims to " de-extinct" such species as the passenger pigeon, declared extinct in 1914.

CNN: Save the planet, then finish high school

The collection contains data on about 900 bird species, some of which -- the Guadalupe storm-petrel, Labrador duck, Guadalupe caracara, great auk, Carolina parakeet and passenger pigeon -- have gone extinct.

CNN: Ninety years of birdwatchers' notes going online