Admittedly, the upRoar is within myself, as I get frustrated at what goes on at the Zoo AND especially when those in authority positions do nothing about it.
SO this sign is posted in several places along the big cat "bedrooms" in the San Francisco Zoo Lion House. It states "use your indoor voices", which translates to NO yelling, loud talking, or making sounds, including clapping and roaring, in an attempt to get the animals attention. It is the job of Security to enforce these rules.
Today, I witnessed a new gal just standing there chatting with people (on two different occasions), ignoring the disrupting sounds. In this clip you can hear screaming kids, as well on another stop inside, I also stood next to a group who was clapping, whistling and roaring at the Lions. And there were tons of kids climbing all over the barriers.
There are rules in the Lion House for a reason.