Monotremata
Monotremes are a rarity in our world, comprising of the most aberrant mammals known. The strange cross between a porcupine and a kiwi that is the echidna, and the even odder duck-billed, poison-spurred Platypus. Like with most things that seem odd to human ideas, Different World takes these oddities and runs with them, securing them even odder places in the imagination. Monotremes with their egg-laying and, on Diff World, un-nipples, certainly stand out amongst mammals. Even their behaviours tend to be odd, with the badger-like pincushions that construct huge and elaborate 'duggees', and the intriguin Bunyip-Buggerers, and their unique relationship with the huge Bunyip phytosaurs.