Draw a entrance gate in the big chart paper. Let it be at one corner at the bottom.Give a name to the zoo.
Paste the pictures at different places.
Mark a path to different animals.
Try put a cage or a seperate area for different animals.
Let your child do it.
After making all this the zoo is ready. Now have a finger tour (use your fingers) to move around the zoo and give a brief description about the animals to your child.