A federal study has indicated that armadillos are becoming established in parts of Indiana rather than appearing only as rare oddities. Their presence also seems to be spreading. What's happening? As WTHR reported, a U.S. Geological Survey study found that armadillos have been seen in Indiana, especially in Marion County and much of the southeast. It said their range is also extending north and west. The Wabash and White rivers may be serving as…