It was a good day for spotting dabbling ducks at the Exeter Wastewater Treatment Plant on Aug. 31.Eighteen blue-winged teal, a green-winged teal, an American golden-plover, a pectoral sandpiper, an adult little blue heron, and three northern shovelors were seen there and recorded as part of this week's rare bird alert by NH Audubon Society.A rare sighting of an immature black tern was seen at the Wilder Dam on the Connecticut River near Hanover on Sept. 1 and 2 and also included in the report.Migrating common nighthawks were reported from numerous locations throughout the state during the past week including 718 from Concord on Sept. 1, and 252 at Powder Mill Pond in Hancock on Aug. 27.The seacoast had a number of other sightings reported including a Baird's sandpiper, a western sandpiper and five ruddy turnstones at the north end of Jenness Beach in Rye on Aug. 30. A white-rumped sandpiper was also seen there on Aug. 31.A western sandpiper, an American golden-plover, a least tern, a lesser black-backed gull, and a laughing gull were all reported from Hampton Harbor on Sept. 1.At least four whimbrels were seen along the coast during the past week.Seven least sandpipers, a semipalmated plover, and three greater yellowlegs were reported from the Lake Umbagog area in Errol during the past week.A pied-billed grebe was seen at Cherry Pond in Whitefield, and four Bonaparte's gulls were seen in the North Country during the past week.Several red crossbills were reported from the Squam Lakes Natural Science Center in Holderness on Aug. 30. One was reported from Freedom Town Forest on Aug. 30, and three were reported from Effingham on Sept. 1.Four white-winged crossbills were reported from the Freedom Town Forest on Aug. 30, and one was reported from Berry Bay in Freedom on Sept. 1.A female black-backed woodpecker was reported from the Nancy Pond Trail about one-quarter mile east of the east side of Nancy Pond on Sept. 1.Two Philadelphia vireos were reported from Lyman on Sept. 1.A Tennessee warbler was reported from Ashland on Aug. 27, and two Cape May warblers and a bay-breasted warbler were reported from the North Country during the past week.Two vesper sparrows were seen in Penacook on Aug. 31.A pine siskin was seen in New London on Sept. 1.A peregrine falcon was seen in Hancock on Aug 31.Raptor migration is now under way with migrating raptors already being seen from the Pack Monadnock Raptor Migration Observatory in Peterborough, and from the Carter Hill Observatory in Concord.Come to those staffed observatories this fall season to help out with the count, learn new ways to observe and meet other birders.If you have seen any interesting birds recently, you can leave a message at the end of the recording or send your sightings to the RBA via e-mail at: birdsetc@nhaudubon.org. Please put either "bird sighting" or "Rare Bird Alert" in the subject line and be sure to include your mailing address and phone number. 19003418