See rule 4B of ABA Rules below;
ID by sound only looks like its OK
http://www.americanbirding.org/resources/reslistru2.htm

Bob Churi
Owings

Fran Saunders wrote:

>I don't remember where I saw it and perhaps it is just something of a "code
>of honor" (and certainly nothing official), but I believe I read something
>like: The first sighting for any major list should be visual.  Thereafter,
>the bird can be counted if heard only.  Sounds reasonable, anyway.
>
>Fran Saunders
>Silver Spring, MD
>MOS Web Site Director
>
>
>-----Original Message-----
>From: Maryland Birds & Birding [mailto:[log in to unmask]] On
>Behalf Of Barry Marsh
>Sent: Tuesday, April 27, 2004 8:44 AM
>To: 
>Subject: [MDOSPREY] Chuck-will's Widow & Voice ID Life List Question
>
>Hi,
>
>A wonderful weekend kayak camping trip at Assateague Island National
>Seashore helped me add a new bird to my life list, the Chuck-will's
>Widow...I think.  The Park's list includes the Chuck-will's Widow, and,
>based on another kayaking birder's ID and listening to sound files
>afterward, we're pretty sure we heard them all around the Green Run
>backcountry campsite through the evening hours Saturday and Sunday.  But
>we never saw any.
>
>So far, every bird on my North American life list (255 species to date) is
>one I've gotten a good solid look at.  Chuck-will's Widow would be the
>first I'd consider adding based on voice alone.  What is the general
>feeling among birders about including in their life lists birds one has
>heard but not seen?  Thanks!
>
>Barry D. Marsh
>Baltimore, MD
>
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--
Robert Churi
Lockheed Martin         DMSP OTSU @Suitland, MD
301-817-4051            FAX 301-457-5043



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