OK, searching for help on what little info I can provide . . . night time critter, a bug of some sort I believe, heard in the trees in the yard of a house in Mansfield, MA. I live 45 minutes north of this house and I don't have these and I have friends that live on Cape Cod and they don't have them either.
Basically a two-syllable noise, sort of cricket like but not your typical black cricket 'chuuurup' - they make more of a rickety wood sound, like if you stepped on a loose board or if you had a sorta squeaky shoe. "reeeh-eh reeeh-eh" - hard to tell if it's one making both syllables or if it's two, each w/its own syllable answering eachother. Each syllable only lasts 1-2 seconds. Very quick back and forth.
They are 100% definitely in the trees, not in the grass and they are fairly loud. Usually I can 'google' stuff and find things out but I don't know where to even start - I'm hoping somebody on here has 'em too.
TIA LeeAnne