The St. Louis Zoo's 228-foot-long free-flight one has been there since the 1904 World's Fair
The gigantic 228-foot long Flight Cage was built by the 
Smithsonian... [DOC] [TLE] Google+ [PAR] They will stalk their prey to within 100300 metres (330980 ft), charge towards it 
and ... Cats have been known to extirpate a bird species within specific regions 
and may have ....