To widen the collection, I am thinking about collecting animal banknotes. If you have some (looking for UNC only), send me a message. I have few banknotes (only 1 UNC though) for swap (or even sale) or I may exchange for coins if the offer is good.
Thailand P-130 20 baht has a rabbit on the back in honor of the king being born in the year of the rabbit. I have a aUNC copy in case you are interested in a small trade.
There is a full series of Bank of Canada notes from 2 dollars to 1 thousand. Each denomination has a common Canadian bird on it. 2$ American Robin, 5$ Kingfisher, 10$ Osprey, 20$ Loon, 50$ Snowy Owl 100$ Canada Goose . I never had a 1000 and they will be withdrawn soon.
Best animals I have seen are on the Tanzanian bills. An elephant on 10,000 shilingi, rhinoceros on the 5000 shillingi. I have a 25 billion dollar Zimbabwe note with two giraffes on it.
I have a 5$ New Zealand note, paper and plastic with Hillary and Mount Everest on the front and a Hoiho (penquin) on the back.