From yesterdays trip to Star Island NH, with Dan Fallon, Dennis Parslow, and Greg Tillman. Bird found by Greg Tillman 15 mins before departure of boat. Initally called incessantly, it ceased just as I arrived with sound recording device. Compared immediately upon departure with calls from Audubon app on Iphone, two people suggesting call an exact match for Willow, one person opting for Acadian. All agreed it was not an alder. No tail or wing flicking observed.