I still qualify as a relative newbie and am especially poor at birding by
ear, so please forgive any less-than-brilliant questions I'm about to ask,
This morning on Rt. 2 in Richmond, after dropping my son at at daycare, I
heard a sweet trill high in the willow tree above me. I found the bird with
my binos, but due to its height and the angle of view, as well as the sun,
it was impossible to make out very much. What I could see of the underside
was not very colorful -- from where I was standing it looked light gray
underneath, and the beak looked blackish, but that was really all I could
make out, and that only just barely.
I think there's a good chance I was looking at a warbler, but obviously not
at all certain -- it's even possible it was a sparrow, I couldn't make out
the beak shape, although I would lay odds it was an insect-eating beak. The
trill was certainly akin to a pine warbler's, but I could not make out any
color at all on the bird I saw, and I was under the impression that a pine
warbler would have looked more yellow.
I'm wondering what, if any, other birds have a song that is a monotone rapid
trill repeated at brief intervals, with no other defining characteristics,
might fit the description I just gave, and might be found sitting perched on
top of a willow tree (near woods).
Anyone care to speculate?