What is Making This Sound?

Last night we heard these loud trilling calls until about 2:30 am. We taped them and I’ve posted a little vid with the recording on youtube, linked above. What are the creatures making these sounds? I would love to find out, if anyone knows!

UPDATE: Matthew Wills, who writes the Backyard and Beyond blog sent this link to a herpetologist who identified the creature making this crazy sound as a Gray Tree Frog. Thanks, Mathew and Friend!

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