I heard this bird call at Powell Butte Nature Park in Portland, Oregon on June 15. I tried to get a look at the bird, but couldn’t see much. It appeared to be small, about the size of a warbler. It looked mostly brown, with possible black or yellow patterns as well. However it was late in the evening and somewhat dark, and the bird was behind a lot of branches, so I don’t know for sure what I saw. Take these descriptions with a grain of salt. The bird was in the coniferous forest. It’s been bothering me a lot lately, so I hope someone can help me with this!
Just want to clarify, there’s also a song sparrow chirping in the recording. Ignore that. Also I assumed the bird was a type of warbler, but I’m likely wrong.