This is the characteristic (and diagnostic) "double drum" of the Pale-billed Woodpecker (Campephilus guatemalensis), usually done every 30 seconds or so. This bird was signalling in the river bottom at El Gavilan, near Puerto Viejo de Sarapiqui (Costa Rica), 6/20/99.
Douglas Von Gausig (recordist; copyright holder), Naturesongs.com
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