I hadn't considered that.  If that's a tree frog then there are 
several of them scattered around a several block area because the 
sound appears to move from tree to tree. There is no call and answer 
- it seems to be from a single source that seems to be mobile because 
it never seems to be in the same place for more than a couple of 
toots and then it moves. It seems to be from the tops of the trees 
(lots of big oaks).  I don't hear it at night - only in the mornings.

Melanie

>You're probably hearing a frog - perhaps some kind of treefrog. It's 
>amazing how bird-like some of them can sound. There have been frogs 
>outside my bedroom window that call with a single toot like that, 
>and they will do it off and on all night if it's warm enough!
>
>June
>
>--
>June Tveekrem
>Columbia, MD
>tweekiebird |AT| southernspreadwing.com
>
>
>
>
>----- Original Message ----
>From: Melanie Lynch <>
>To: 
>Sent: Mon, April 12, 2010 4:24:34 PM
>Subject: [MDOSPREY] What can I be hearing?
>
>It sounds exactly like the tin-horn toot of red breasted nuthatch 
>but only in short single beeps instead of the repetitive toot that 
>you might expect from a RBNU.  I've also gone through the 
>woodpeckers.
>
>I've been hearing them hear them every morning for the past two 
>weeks and I can say with certainty I am not hearing it as part of a 
>mockers repertoire. I'm not hitting anything in the Stokes CD's but 
>then, I'm running out of patience and getting frustrated. Best guess?
>-- Melanie Lynch
>Annapolis MD


-- 
Melanie Lynch
Circulation Manager,
Chesapeake Bay Magazine
Guide to Cruising Chesapeake Bay
Intracoastal Waterway Facilities Guide
410-263-2662 ext 11
877-804-8624 (toll free)