You collect them from your animals
No you cannot
pay cash
No, you cannot.
when your animals have little coins above their heads tap those and you will get coins and experience. To get an animal go to "Animals" and you can use your coins to get one.
Reach level 17 and you can buy the whale for 2,500,000 coins coins
Once they finish breeding and you place them in your zoo, they start generating coins as well.
Tap the "Add More" thing beside your treats. At the bottom, it says "Earn Free Ways" or something and you just go from there. Gaining levels puts more coins for choice. Ex.: Download Tap Zoo and get free coins! (Lets say.. 1,000) 3 LEVELS LATER Download Tap Zoo and get free coins! (Like 24,000) It's a shame they don't do this for the treats to!! I've searched and searched and I still am on how to get free treats. I haven't found anything yet, but if I do, I will update this. Hope this helps out a little! :)
999999999
A Hippo does not cost coins. It costs 68 stars per hippo.
Reach level 24 and buy it for 17,000,000 coins
You can't you have to purchase it
I wish I knew