Giraffes make poop, which become coins. And giraffes poop a lot. And I mean A REEEEAL LOT of pooping.There are also different kinds of poop, each of which give different amounts of coins. The better the giraffe, the better the poop. And the better the poop, the better the coins. And better the coins, better the giraffes. It's a cycle that goes on forever.
You can find out more about poop in the currency section.