You're welcome. This poster was on the back of a phone box in Rundle Mall. I'm sure the poster is a bit of fun street art and not something the council put up.

Interestingly each year about 10,000 to 12,000 tree martins roost in a small group of trees in Rundle Mall over Summer/Autumn. I thought they'd have migrated elswhere by now but they are still around. It's an amazing sight to walk under the trees in the middle of a city pedestrian mall, and see thousands of little birds chilling out at night. If you search Adelaide tree martins there's a few photos and videos out there.