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:oops: Of course it`s prepositional case. I`ve made a mistake :oops:
Sorry, I was in haste :cry:


It`s my self-portrait :roll:
You should love the cartoons with Funtik :D

Ушел (куда?) в зоопарк. The word "зоопарк" is in accusative case (винительный падеж).
The words in accusative case usually end on у(ю) or don`t have the endings.
For instance:

I often go to the...