Field Sparrow can give that impression, because its song too is delivered in accelerando, sometimes even with a slight rise in pitch. If you have the Audubon Birds app, you can compare Track #3 for both species to see what I mean.
Sent from my iPhone
> On Apr 20, 2017, at 10:13 AM, Karen Steffy <ks247...> wrote:
> I heard the ascending sound of what I think is a prairie warbler this morning, but it seems early. Is there a bird that has a similar song to a prairie warbler?
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