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call in association with a hunched wing-spreading display (Short 1974). Drumming is variable (fast or slow) in long, even rolls (Farrand 1983; Goggans 1989). Drumming described as coming in 2-second bursts that taper off at end, at intervals of 30-40 seconds, suggestive of pileated woodpeckers (DRYOCOPUS PILEATUS); also gives single raps when nervous or about to roost (Kilham 1966). See Short (1...

VOCALIZATIONS: a loud, characteristic kuk-kuk-kuk-kuk; drumming a deep resonant roll that carries a kilometer or more. Source: Encyclopedia of Life