1978 May Melanerpes erythrocephalus FLORIDA Pasco Co., 4 mi E of Zephyrhills. Clear, warm, light breeze; Pine flatwoods. 1500 hrs w/Manny Lopez Saw a nice example of interspecific aggression between Red-headed Woodpeckers and a ♂ Red-bellied Woodpecker. The ♂ RB landed in a tree about 100 m from the nest tree of a pair of RH. One RH, nearby, supplanted the RB several times in succession, the RB flying short distances away each time. Once I heard the RH give the “charr, charr” call (Kilham, 1977). Finally, the RB began a long [illegible] flight more or less around the perimeter of the RH territory, with the RH in pursuit. The other RH of the pair had been in the nest cavity (incubating?), but it left the cavity and joined in pursuit. Pursuit ended about 200 M from nest tree. 2 May FLORIDA Hillsborough County, Temple Terrace Clear, warm light breeze. Longleaf Pine - Live Oak woodlot between 4th + 5th hole. 1900 - 200 hrs Watched the pair of RH's that I had noticed the day before. One of the pair spent much of the time around the large dead tree, poking around in several of the incipient and existing cavities. Much tapping and moving about in tree. Birds fed by scanning open ground, then flying to ground to pick up insects. Again saw mild aggression against a Red-bellied Woodpecker, ♀, mildly supplanted by the RH that had been working on nest cavities. This occurred about 50 M from nest tree. Also saw agonistic behavior with Starling at roost tree, with RH briefly giving “quirr, quirr.” Saw no aggression when Common Flicker landed and flew through territory (twice) or when another RB landed 30 M from nest tree. Neither RH appeared to roost in dead tree.