When Europeans first arrived in North America, they exterminated three to five billion passenger pigeons (Ectopistes migratorius) in the short span of a century through a combination of habitat destruction and hunting. In 1914, the last living passenger pigeon perished at the Cincinnati Zoo. Despite the staggering scale of this extinction event, three species of vulture from Southeastern Asia retain the dubious distinction of having had the most rapid population crash of any avian fauna. They might not have begun with numbers as large as the passenger pigeon, but within the space of a single decade, their populations were reduced by 96 to 99 percent.
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