It is the second largest theme park in the world , behind Six Flags Great Adventure in Jackson , New Jersey , and it is the largest single Disney theme park in the world , covering 500 acres ( 200 ha ) , and is also the first Disney theme park to be themed entirely around animal conservation , a philosophy once pioneered by Walt Disney himself .
It is also the first Disney theme park to be themed around animal conservation , a philosophy once pioneered by Walt Disney himself .