I have an idea for a content UPDATE for ZooStory ... I really hope someone reads it ...
The problem of the game is that you earn coins for ... ehhh ... nothing, since after like one week no one needs coins anymore.
Let?s remember why we play the game ... because we like the cute animals.
So what I suggest is, that you implement something that allows you to spend coins to do some improvements on your animals. Means for example that you get a new button that allows you to TRAIN the animals. Means you spend some gold and the animal gets a "training bar". If you level the animal up, it learns a NEW MOVE, means instead of siting there and just blinking, it will do some animated maove from time to time. Like four levels of moves per animal I suggest. Level four should be insane expensive, but do something AWESOME, like the dragon flying around you zoo.
Another feature would be to change the color of the animals for some gold, by buying color berries.
With NEW MOVES and colored animals, it would be interesting again to check the zoo of an other player, since maybe he has something interesting happening in his zoo.