Carol, hard to tell from your description, but Chipping Sparrows have a
very steady, long, almost mechanical trill, and I find sometimes it sounds
a bit robotic/metallic. Could that have been it?

-Miriam Lawrence

On Wed, May 11, 2016 at 9:12 AM, Carol R Heffer <[log in to unmask]> wrote:

> I was walking in Symanski Park Monday morning and heard a sound I at first
> thought was a small machine. I realized it was a bird trilling. It was
> joined by a second at a lower pitch. It went on for a long time. I tried to
> find it on my Merlin app, to no avail.  Anyone know what it might be?
> Carol
> Sent from my iPad

Miriam Lawrence
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