You can do a search of possible birds in the area here. http://identify.whatbird.com/mwg/_/0/attrs.aspx Choose location for starters, and then go in and listen to the calls. Most all the birds in our database have a recorded call on the species overview tab.
You can rule out bear by calling your parks department and ask what bears might be in the area and have there been any reported sightings.
Good Luck
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