Archie, one of the White Rhinos at the Jax Zoo had escape his pen early morning and was 100 yards away from his barn but on Zoo propety. No visitor got in harms way due to it was before zoo opening and was not on path for the public. The error was due to human error since the door wasn't close properly.
Link:
Rhino Escapes Pen In Jacksonville Zoo - Jacksonville News Story - WJXT Jacksonville
Link:
Rhino Escapes Pen In Jacksonville Zoo - Jacksonville News Story - WJXT Jacksonville