While I haven’t as yet read the full text of the research paper posted on 
the Avian Conservation and Ecology web site relating new Ivory-billed 
Woodpecker claims I have listened to the appended sound files. In these 
files the putative Ivory-billed drum and a Pale-billed drum (recorded in 
Costa Rica) are similar. There is no Pale billed call in the appended 
files. I, however, did find both calls and drum of the Pale-billed in the 
CD, Costa Rican Bird Song Sampler-Cornell Laboratory, Library of Natural 
Sound. The drum is similar to that in the ACE files but the calls are 
different. From my own Costa Rican birding I’m familiar with the 
characteristic double note drum.  I’m not familiar with the call-either I 
can't recollectit or perhaps never actually heard it.

There is another common Campephilus woodpecker  (Powerful Woodpecker -C. 
pollens), I don’t know how widely distributed but I’ve seen them in 
Ecuador. I’ve found audio files of the drum and calls on the DVD, Birds of 
Ecuador, Niels Krabbe and Jonas Nilsson. Here are not only is the drum 
similar but so are the calls.

There are other Campephilus woodpeckers and I wonder how similar the drum 
and calls to those on the possible Florida birds.

I’ll e-mail the Powerful Woodpecker calls and drum to those requesting.

Phil Brody