1)2 General Field Notes: Red-cockaded Woodpecker Southern Flying Squirrel Displaces a Red-cockaded Woodpecker from its Cavity Theodore R. Ridley, Gregg L. Chapman and Susan C. Loeb Southern Research Station U.S.D.A. Forest Service Department of Forest Resources Clemson University Clemson, SC 29634. The Red-cockaded Woodpecker (Picoides borealis), an endangered species, depends upon the cavities it excavates in living pines for nesting and roosting (Ligon 1970). Cavities, however, are often a limited resource (Ligon 1970). Factors limiting cavities include availability of suitable cavity trees, rate of cavity excavation, cavity enlargement, cavity tree loss, and use of cavities by other species (Conner et al. 1991, 1994; Hooper 1988, Loeb 1993).