Notes and Double Knocks from Arkansas Russell A. Charif, Kathryn A. Cortopassi, Harold K. Figueroa, John W. Fitzpatrick, Kurt M. Fristrup, Martjan Lammertink, M. David Luneau Jr., Michael E. Powers, and Kenneth V. Rosenberg

This supplement contains:

SOM text
Audio files S1 to S5

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• Audio S1
  Known vocalization of ivory-billed woodpecker. These kent notes were originally recorded in Louisiana in 1935. They were broadcast from a portable speaker in cypress-tupelo habitat near the Cache River NWR and re-recorded by an ARU at a distance of 145 m.

• Audio S2
  The sequence of kent-like notes recorded by an ARU in the White River NWR at 0850 local time, 29 January 2005. Eight notes occur between 3 s and 8 s into the recording; they are followed by first a loud musical song of a Carolina Wren (Thryothorus ludovicianus) and then four more kent-like notes. The crackling sound in the background throughout is rain.

• Audio S3
  Double knocks of from pale-billed, powerful, and robust woodpeckers (Campephilus guatemalensis, C. pollens, and C. robustus), recorded 26 April 1981 in Panama, 8 August 1988 in Ecuador, and 16 November 1982 in Argentina.

• Audio S4
  Possible double-knock exchange recorded in the White River NWR at 0645 local time, 24 January 2005. A distant double knock is audible 2 s into the recording. A louder double knock, apparently from a closer source, occurs 3.5 s later. The four loud clucking vocalizations between the two double knocks are alarm calls of an American robin (Turdus migratorius).

• Audio S5
  Isolated double knock recorded in the Cache River NWR, 25 December 2004, 1630 local time. The loud explosive sound 0.7 s after the double knock is a distant gunshot.

Sound files copyright 2005, Cornell Laboratory of Ornithology. Downloading the call or double knock for use in playbacks is prohibited. Playback of any ivory-billed woodpecker sounds in the field is unlawful without proper permits from the U.S. Fish and Wildlife Service.