The Berlin Zoological Garden is the oldest zoo in Germany, opened in 1844 and it spreads over 33 hectares.
When you buy your ticket you get a map of the Zoo, and they even have an app, if you don't want to miss the feeding time. You can find the feeding time on the map also.
I got this nice photo; it's like he was posing for me.
All photos are mine, taken with my phone Cubot Cheetah2, at Berlin Zoological Garden.