11. At one point there may have been plans in Fallout 3 for an intelligent version of the Centaur. Not only does some of the concept art seem to suggest so, but an unused asset attached to the Wasteland Survival Guide quest is Centaur named Clancy. Additionally, Moira says in the entries on her computer terminal that the abundance of tongues on a Centaur suggests that they are capable of speech. This may have been a joke or…maybe the Lone Wanderer was meant to test that theory for her once upon a time!
Another common enemy in the Wasteland may have had a variation that was cut sometime during the development process, the Mirelurk. The Art of Fallout 3 suggests a Catfish species may have once been planned. And a rather unusual idea that got nixed during Fallout: New Vegas was Radioactive Tumbleweed, which would have caused active damage and radiation damage.