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SearchSearch View: Grid 1View: Grid 2View: Grid 3View: Grid 4View: Grid 5View: List The Philadelphia Zoo No Reviews Favorite The Zoo 150th Birthday The Philadelphia Zoo celebrated its 150th anniversary in 2009. So stop by and celebrate this major achievement at America´s first zoo! McNeil Avian Center On May 30, 2009 the 17.5-million McNeil Avian ...