It's actually more of a 4/5 stars place, but I visited on a busy day, so that ruined part of the experience for me.
The Zoo is nice enough (though I expected it to be bigger), but don't do the mistake of going there in a week-end or a Holiday. The number of visitors is mind-numbing. In direct connection with this, most of the animals are rightfully stressed out and tend to move as far away from the crouwds as possible, which means you might not see a lot of the nicer ones, which defeats the purpose of actually going to the zoo (who wants to see a bunch of empty-looking cages?).
If you go there, make sure to check out the penguins, monkeys and Kattas - those are the animals that seem to never shy or tire of the hordes of screaming and waving visitors.
Also, pack a bottle of water and maybe some snacks (though you can eat in a lot of places that cater to all tastes around the Tiergarten). Even if don't stay too long in one place, expect at least 2-3 hours for a visit.
I gotta say that the informations available and the directions are more than adequate. One can always get from one attraction to another quite easily, even though the place is quite sinuous.
Overall, not a bad place to visit in a sunny day :)
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