Not sure what you mean by mini exhibits, is it something similar to the current box exhibits? I do remember that game, and their exhibit format was highly unrealistic, as it just does not conform with the realism (at least in most areas) that Planet Zoo offers. There was another member in here NZfanatic, he offered a suggestion of just having birds on looping animations, in case that the flight animation could not be viable at the end, at the time I did not like this idea, but I have changed my mind with time, since it would allow for more species to be added. In any case, if at the end it is a question of either static birds or even looping animations or just no birds at all, I think the choice is clear.
However, since this is a piece by piece building game that allows for player creativity, Just give us the animals (birds/reptiles/amphibians/small mammals) and the building components, heat lamps, (actual see thru glass, the ones in the game building sections are not as clear as the exhibit ones) mesh for birds, a variety of small plants and hiding places etc, and let us design this exhibits. This way, we will end up with the species, realistic exhibits that offer a variety of sizes and designs, instead of the genetic boxes that end up looking all the same when it comes to interiors. I have altered many of them to not look genetic, but by adding a lot of scenery to the interior the visibility of the animals is highly impacted. In my opinion, this is one area of the game that frontier could have made significant improvements on.