What's the bird called that called this bird call?

Post date: 2020-06-29 11:52:32
Views: 121
The bird was heard but not seen yesterday in Pine County, Minnesota, USA, in thick woodland along the Willard Munger State Trail. The call had an odd, reverb-y, quality, like the bird was creating a couple different tones simultaneously. There seemed to be a call-and-response with other nearby birds happening. Here's a brief clip of some recordings pasted together (with the gain boosted and EQ'd to reduce electronic hiss). Here's an original clip (not boosted or EQ'd) for purists. Any idea what it is?
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