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fossil/subfossil birds of North America

 I have a couple of questions about fossil/subfossil birds of North
1) Has anyone come up with a total number of species recorded in the
fossil/subfossil record for North America?

2) Are there fossil/subfossil species of birds in North America that were
present when humans first colonized North America that are extinct now?

Ian Paulsen
Bainbridge Island, WA, USA
A.K.A.: "Birdbooker"
"Rallidae all the way!"