As for the animal feeding experiences... at Lowry they charged like $3 for ONE small piece of lettuce to feed the giraffes. And where they keep the wallabys, unless they've changed it in the last 2 years, you weren't allowed to touch the 2 or 3 they had on display and they weren't selling food either. But Lowry has koalas, which I wish BG had. BG charges $5 to feed the kangaroos ($4 if you have an AP), but you get a whole cup of food filled to the brim.
So.... I'm not knocking Lowry. It's a very nice zoo, but overpriced in my opinion. They do free admission days a couple times a year, but it's always crazy busy because that's when all the locals come out.