Birds seen this weekend in Carroll County: Saturday at Liberty Lake: Great Blue Heron 1, Great Egret 3, Green Heron 6, Killdeer 18. The lake level continues to drop and shorebird habitat will improve. Sunday at McKeldin Area, Patapsco Valley SP: Non-resident species found: Great Blue Heron 1, Chimney Swift 1, Hummingbird 1, Pewee 11 (many singing), Acadian Flycatcher 6 (heard only, including 1 singing), Veery 1 (heard only, calling), Wood Thrush 2 (heard only, calling), Catbird 2, Waxwing 1, Yellow-throated Vireo 3 (2 singing), Red-eyed Vireo 20 (many singing), Parula 2, Chestnut-sided Warbler 1, Magnolia Warbler 1, Cerulean Warbler 1, Black-&-white Warbler 1, Worm-eating Warbler 2, Scarlet Tanager 2, Baltimore Oriole 1. Bob Ringler