Audio --
Hear the only known recording of the Ivory-billed Woodpeckers captured in 1935 on the Singer Tract, Louisiana (today part of the Tensas National Wildlife Refuge). Recorded by Arthur A. Allen and Peter Paul Kellogg ©2004 Cornell Lab of Ornithology
Hear the "double knock" from the search recorded
in the Big Woods -
http://www.birds.cornell.edu/ivory/field/listening/doubleknock_list
Hear the "kent" call from the search recorded in
the Big Woods -
http://www.birds.cornell.edu/ivory/field/listening/kentone