What examples you know of art pieces in zoos? For example, Berlin Tierpark has many sculptures, some coming from the time when it was a castle park. At Vogelpark Walsrode, in the gift shop there were metal bird sculptures for sale. Probably some local artist put sculptures on display with some form of dividing the money with the zoo. Other zoos theme themselves as mass entertainment, so instead of an art piece one could rather see a fake skeleton in a piranha tank. I think art can be interesting from several points. It can help the image of a zoo as a serious cultural institution and help secure big donations, a favorable look of authorities and silence zoo critics. It can help to educate visitors. It can also raise interest in a particular animal species shown in the art.