The Mammoth, Octopus and Pig Pens ?

they have the animals in them, and they aren't upgradable...I have the mammoth and pig pen, its kind of cute actually!! the pig is in a little dress and hanging on a swing and when you tap on him he is struggling to stay on it, and the mammoth is another elephant dressed up as a mammoth and when you tap him he makes an elephant sound...didn't have the money for the octopus but soon will!!!! ive been wanting to incorporate a zoo in my town so this is working out to my advantage!!!