eastbayray submitted this installation, which was found near the Polar Bear exhibit. Interestingly, the flush handles are installed in different directions.
In 2005, Brian of WhatBrianThinksAboutLasVegas.com sent in this photo: "I noticed your entries for the San Diego Zoo seem a bit outdated. I don't believe they have any troughs anywhere on the park grounds any longer, and they are converting over to waterless urinals",