Berlin's Zoological Garden is the city's classic zoo, right beside the Zoologischer Garten station and the western shopping streets. It has one of the world's largest animal collections, with pandas as the headline draw and the Aquarium next door for reptiles, fish, and tropical displays.
Even if you are not planning a full zoo day, the ornate Elephant Gate on Budapester Strasse is worth a look. Families can easily spend half a day here, and the central location makes it simple to combine with the Kaiser Wilhelm Memorial Church and Tiergarten.