APPENDIX 11. Nine double knocks of a Pale-billed Woodpecker (Campephilus guatemalensis) recorded on May 12, 2006, in Santa Rosa National Park in the Guanacaste Conservation Area of northwest Costa Rica. Recorded by DJM with a Sennheiser MKH70 directional shotgun microphone. All double knocks were produced by the same bird on different parts of one tree, demonstrating the variation in the quality of double knock sounds. The spaces between subsequent double knocks in this sound file have been trimmed.

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