Noisy Tree

I have a neighbour who has a problem with a sound coming from a tree in his backyard ( we live in southern Ontario). It sounds quite a bit like a sqwaking bird but on investigation there does not seem to be a bird present. The sound begins at dusk and continues EVERY 5 seconds!!! through the night. My neighbour thinks that it may stop early in the morning ie around 2 am although this may just be the time he passes out because this thing has driven him to drink. Is it possible that a bug would produce such a loud, persistent, irrititating noise?
Thank you for your help.

Dear BillyD,
Cicadas can be very loud, especially in the late summer.

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