Death's come knocking for the last time for the splendid ivory-billed woodpecker and 22 more birds, fish and other species: The US government on Wednesday declared them extinct.It's a rare move for wildlife officials to give up hope on a plant or animal, but government scientists say they've exhausted efforts to find these 23. They warn climate change, on top of other pressures, could make such disappearances more common as a warming planet adds to the dangers facing imperilled plants and wildlife.
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