This is the tonal quality I most associate with American Crows. I hear it occasionally around the neighborhood, not sure if it's my local birds sometimes switching to the more typical calls, or a visitor passing through

www.youtube.com/watch?v=Pkd2Nvv8RRo
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We have American Crows and Fish Crows (who are newer residents drawn in by two large lakes but stayed very localized), and the Americans have over the years adopted some of the lower, croaky vocalizations. So much so I’m not sure which I’m hearing unless I’m also watching them. Cool stuff.
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