I believe this refers to the courtship dances that sometimes accompany singing...

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From: Bob Mumford <>
Date: 2004/05/24 Mon PM 01:37:29 EDT
To: 
Subject: [MDOSPREY] Signing birds

I just read the third report this spring of a signing bird in this area.
This time a prothonotary warbler.  I am simply amazed.  Has Gallaudet University
opened up a new department to teach our avian friends?

This opens a whole new category for the listers

Bob Mumford
Darnestown
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J. Steven Huy
Middletown, MD, USA

www.ProjectOwlnet.org