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Even if it is an amusement park, they are now required to post per 30.06 to be off limits (clause (i)). I am pretty sure that the Ft. Worth Zoo is on publicly owned land, but I don't have any hard data to point to to back up that assertion. Be careful, and, if you decide to pack, keep it concealed unless you need it.

Edited to add: According to the About Us page of the Ft. Worth Zoo web site, the zoo is owned by the City of Ft. Worth, but managed by the Fort Worth Zoological Association. Since the premises are owned by a government entity, 30.06 is excepted, in my (and most other's around here) opinion. I still say beware any unintentional failure to conceal, though. Have fun at the zoo!