Loading video... VIDEO: The USC-led research team used advanced CT scans and comparisons with humans, primates and other fossils to interpret Little Foot's shoulder bones, seen in this video animation. view more Credit: Kristian Carlson A long-awaited, high-tech analysis of the upper body of famed fossil "Little Foot" opens a window to a pivotal period when human ancestors diverged from apes, new USC research shows. Little Foot's shoulder assembly proved key to interpreting an early branch of the human evolutionary tree. Scientists at the Keck School of Medicine of USC focused on its so-called pectoral girdle, which includes collarbones, shoulder blades and joints.