New Hampshire is – or was – at the extreme northeastern edge of the range of a sky blue songbird called the Cerulean Warbler. For two decades small numbers of this species made their home in Pawtuckaway State Park, with occasional records elsewhere in the southern part of the state. But in the late 2010s, Cerulean Warbler started to become unreliable even at Pawtuckaway, prompting NH Fish and Game to list it as Threatened in 2017. Surveys conducted at historic sites by NH Audubon in 2017-18 fail