Currency. Every society (more or less) uses it, but have you ever stopped to stare at the amazing array of creatures that are detailed on the back of those crumpled pieces of paper (and now, plastic) we stuff into our pockets and wallets each week? From the Philippines’ pikoy, to Bermuda’s bluebird, onto the splendid array of South African safari animals, here are some of nature most beloved beasts, as illustrated on the humble banknote.