Passenger Pigeons, Now Extinct, Needed Big Flocks to Survive 1 234 567

Passenger Pigeons, Now Extinct, Needed Big Flocks to Survive

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Passenger pigeons were once so plentiful they could darken the daytime sky when they flew over North America, but oddly, their abundance may have played a role in their extinction, researchers said Thursday.Though it may seem counter-intuitive, the pigeons (Ectopistes migratorius), evolved quickly and in the process, lost certain traits that might have been useful for surviving in smaller groups, said the study in the journal Science.The findings have implications for other creatures...

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