Information Bulletin 92-84. A.J. Nault, and M.C. Woodin. Intestinal morphology differs between gulf coast redhead populations. National Biological Survey Research Information Bulletin 74. A.J. Nault, and M.C. Woodin. 1996.
Redheads wintering in Louisiana and Texas have similar diets.
National Biological Service Information Bulletin 10. Michot, T.C., and W. Norling. Low incidence of pairing and courtship behavior in redheads wintering in Louisiana. National Biological Survey Research Information Bulletin 75. Michot, T.C., K. Roy, and M.C. Woodin.