When it comes to world design, the devil's in the details. Yeah, different kinds of dragons, chimeras, and other magical beasts are nice but what about the common creatures. Are the breeds of dogs and horses different, or are they just like the real world's with different names? Or do people ride an entirely different kind of animal? What sorts of creatures do people keep as pets? What unique plants and trees exist in the forest outside the city? Basically, how is your world's ecology different than earths? Has anyone ever created mundane plants and animals for their campaign worlds, or do most people think such details are beneath notice? Feel free to post examples from your campaign.