Noah's Ark lol, I've collected most (only missing 100% size Llama and 0% size Polar Bear + Sun Bear) animals, two of each, of both sizes, the smallest 0% and the biggest 100%. There really is a big difference between the smallest and biggest which is fun!
Love the sandbox mode where all animals won't die and can live in harmony, now to create a good zoo for all these BIG and SMALL animals.
There are some mod animals in there, Markhor, Shoebill, Victoria Crowned Pigeon, Aye-Aye, Kiwi and Southern Ground Hornbill so if you don't recognize all animals it's because they aren't official.