You can tap the coin or star sign on the top right hand corner and download apps for free or pay for them
You cannot earn stars on tap zoo. You need to buy them through the app by paying real money.
Sometimes they have special offers like signing up for their email list and you will get 3 stars. Other than that no.
Buy them from the "store" on the app.
I wish I knew
No, you cannot.
Near as I can tell you either have to pay real money and buy some or download apps (some free and some cost) and get them that way.
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Reach level 19 and you can buy it for 49 stars
You have to buy them for real money or you can earn them by clicking on the bell icon.
Its a crossbreed between a Walrus and a Seal and it costs 13 stars
Reach Level 17 and you can buy it for 489 stars
Reach Level 17 and you can buy it for 489 stars