Direbeasts (Larger variations of real-world animals) as well as several homebrew creatures inspired by real-world animals that I'm trying to keep believable. South Ardacia has "Kite-Snakes", for example, which are snakes with flaps used for gliding. North Ardacia has crabs that copy sounds they hear to hunt (sometimes mimicking human voices and causing shipwrecks), etc. Orlandis has more fantasy elements like dragons and sand-worms, but it's also the "foreign other" backdrop where things are supposedly less civilized.