I like their signs. I don't go to the zoo often (it kind of depresses me when I see some of the limited spaces that most of the animals have) but I get annoyed when I see how some people act.

I've been to both the Lincoln Park and Brookfield Zoo lately. I wish I'd taken a snap of the sign at Brookfield that showed a turtle with its shell in an hourglass shape due to a 6-pack plastic piece.