Wilds of Moosehead     June 16-17, 2007     Moosehead Lake lived up to its reputation for great birding. The lifers piled up as the weekend went along, since the birds seldom stopped singing. Guests of the Greenville Inn and Evergreen Lodge spent Day One exploring the birding secrets of the east side of Moosehead Lake and Day Two exploring the west side. It takes a full day to cover one side of the lake, since Moosehead is the largest lake east of the Mississippi that is wholly contained within the borders of a one state.     Timing was excellent. Gray Jays had just fledged their nestlings, so locating the curious youngsters was not difficult. Boreal Chickadees turned up in multiple places. A weekend highlight: Wilson's Snipe were particularly noisy near any wetland location, alternating between their joyful sky dance and their chronic complaining in the marsh. A Cape May Warbler surprised the guide, who had staked out a Bay-breasted Warbler near Shirley Bog the day before the trip and was astonished when the more elusive warbler turned up instead. Brown Thrashers are not common in northern Maine, but one nonetheless popped out of the treetops and sang merrily in Greenville Junction. An Olive-sided Flycatcher could be heard just a mile beyond, along a road that is notorious for warbler variety, and the group collected more than half of the weekend's warbler sightings within the first hour of the trip. Later, during a drive up to the B-52 crash site, numerous Blackpolls were found singing in the clear cuts on Elephant Mountain.     Sunday morning's trip up the west side of the lake added Black-throated Blue and Chestnut-sided Warblers - birds that were uncharacteristically reclusive the day before.