NOTICE: the original release of this game had a glitch which prevents progress beyond Chapter 5, this has been fixed with a game update:
*** Spoiler - click to reveal ***update on oct 15, 2014 that brought both versions to 1.0.11.4161 has fixed snow leopards.
Ch.5 The Snow Leopard Habitat: requires you to buy a Snow Leopard Habitat for $30,000. whenever i click to purchase this item from the store it exits the store but does not allow me to place the Habitat. afterwards i cannot reenter the store until i reload the game. it prevents any further progress through the story which is needed for this and several other achievements.
the Animal Exhibits are the smaller animals that you cannot grow, feed, adopt or breed. they pretty much take care of themselves and just require you to collect money and restart them when the timer runs down. the larger ones are called Star Animal Habitats.
this game is very linear, you can only unlock things in pretty much one order. to unlock the 10th Animal Exhibit, you must reach chapter 8. it will be the Peacock.
my suggestion for getting through the missions as fast as possible is to not spend money on anything except mission requirements. otherwise you will fall behind and have to wait for profits from concessions, exhibits, and habitats, or worse resort to clicking decorations repeatedly. this usually only gets you a $5 coin every 5 seconds, which can add up if you don't mind sitting and clicking repeatedly.
the easy way to do it is to not pick up the coin, but to wait until the coin moves up to your status bars at the top on its own. as soon as the little spark travels across the money bar, you will know it's time to click the decoration again. at $5 per 5 seconds, you can get about $60 per minute or about $3600 per hour with constant clicking.