The motion of tracer fibers settling in a suspension made optically transparent using an index-of refraction matching technique is studied as a function of concentration, aspect ratio, fluid viscosity, and fiber length distribution. At Re similar to O(1), two different regimes of sedimentation are clearly identified. For small volume fractions we find that fibers settle with their long-axis preferentially in the horizontal state. With increasing volume fraction, fibers settle preferentially with their long-axis aligned in the direction of gravity. These findings are strikingly different than for those conducted with Re -> 0 and qualitatively support the numerical simulations reported by Kuusela et al. (c) 2007 American Institute of Chemical Engineers.