20 YEARS AGO July–August 1998 On August 2 a juvenile Black Vulture fledged from the Blue Hills in Milton. This represented the first confirmed breeding record anywhere in New England. A Purple Gallinule was on Nantucket from July 12–August 7. Chatham hosted a pair of American Avocets , as well as the Bar-tailed Godwit that had previously overwintered in Plymouth. Flycatchers stole the passerine show with a Scissor-tailed Flycatcher on Martha's Vineyard and a juvenile Fork-tailed Flycatcher at Plum Island which stayed for over a month. A Northern Wheatear was found on Nantucket on August 30. Best sighting: a Red-necked Stint in breeding plumage was at the end of Duxbury Beach, August 21–September 7. Shuttle buses to the site allowed many birders to enjoy this third record for the state. 40 YEARS AGO July–August 1978 Monomoy hosted up to 150 Hudsonian Godwits during August, while 2,500 Red Knot s were counted at Scituate on August 3. A Sandwich Tern was found at Tuckernuck Island on August 21. The peak of the Common Nighthawk flight was 1,180 birds over Wellesley on August 30. A Loggerhead Shrike was at Plum Island on August 19. Best sighting: a Lewis's Woodpecker photographed in Lunenburg on May 26 represented the third record for the state.