We banded an Acadian Flycatcher last week at the World Bird Sanctuary, and there was another Empidonax in the woods the same day, but neither of them vocalized.   We saw an Acadian Friday on a trail at Eagle Bluffs near Columbia which did vocalize, but those are the only ones I've seen. 
Pat Lueders, Webster Groves, MO
The Audubon Society of Missouri's Wild Bird Discussion Forum
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