For 10 points, name this once ubiquitous American bird.
Pike County, Ohio sheriff Henry Clay Carnes may have framed a boy named Press Clay Southworth in an incident involving one of these things named Buttons in 1900.  These things are the "flagships" of Stewart Brand's Revive &amp; Restore project.  A monument to these things that blames "The Avarice and Thoughtlessness of Man" was erected in 1947 in Wyalusing State Park in Wisconsin.  An 1857 resolution by the Ohio state senate, which the Ohio Historical Society ranked as the fifth most embarrassing thing to happen in Ohio, states that these things "[need] no (*) protection Â… no ordinary destruction can lessen them".  David Mrazek's documentary From Billions to None chronicles these things, as does Joel Greeneberg's book, A Feathered River Across the Sky.  They feasted on acorns and beechnuts. Males of this species had a slate-blue color.  The last one, Martha, died in the Cincinnati Zoo.  For 10 points, name this once ubiquitous American bird.
Pike County, Ohio sheriff Henry Clay Carnes may have framed a boy named Press Clay Southworth in an incident involving one of these things named Buttons in 1900.  
passenger pigeons [or wild pigeon; or Ectopistes migratorius; prompt on pigeon] 