Fig. 3. Dimensions of nest cavity holes for large cavities along the Choctawhatchee River. Vertical diameter (A) and horizontal diameter (B) of cavity entrances for 131 nest cavities. Full ranges of published dimensions of Ivory-billed Woodpecker cavities (Tanner 1942) and Pileated Woodpecker cavities (Tanner 1942, Bull and Jackson 1995) are shown.