"Ask me about composting at the Zoo" his sign says.
I think most of us would gladly ask this nice young man.
Hint: enlarge the photo. See anything funny?
This article about the Green Team at Jerusalem's Biblical Zoo says
"We make our own organic compost
by mixing organic matter (Zoo Doo) from our animals, mixed with plant
material producing an excellent fertilizer, great for gardening."
(Linking to Lesley's meme, Signs, signs.)