One of the Museum's most beautiful objects is a flicker feather headdress, which was recovered during 1939-1940 excavations of Mantle's Cave in the center of Dinosaur National Monument in the far northwest corner of Colorado. This area was inhabited prehistorically by a hunter/gatherer/horticulturalist group that archaeologists call the Fremont, and in historic times by the Ute, a Numic-speaking tribe.