Gary Drescher wrote:

I assume that's either
because the exclusion zone is too low for radar coverage, or else because
it has too much traffic for them to issue advisories there.

I'm not sure about the coverage, but can definitely see the problem issuing
advisories for that (as Roy calls it {8^) zoo. I've never tried this
myself, as - if I'm going to be in the zoo - I'd rather be on the same
frequency as all the other animals laugh.

- Andrew