Dori/CCSA Cliff Swallow Petrochelidon pyrrhonota ADULT Has bluish black cap and white-lined bluish black back. Note the pale collar, reddish orange...	Andreas Trepte/CCSA Common Eider Somateria mollissima ADULT MALE Has mainly black underparts and white upperparts, except for black cap, lime green nape...	Calibas/CCSA Common Goldeneye Bucephala clangula ADULT MALE Has mainly black and white plumage. Rounded, peaked head appears dark in poor light,...
Mdf/CCSA Common Grackle Quiscalus quiscula ADULT MALE Looks all black in poor light. "Bronzed" ssp. has blue head and bronze sheen...	Matt MacGillivray/CCSA Common Loon Gavia immer ADULT In summer has iridescent greenish black head and neck; note two rows of white stripes...	Mdf/CCSA Common Merganser Mergus merganser ADULT MALE Unmistakable, with bright red-orange bill, glossy green head (looks dark in poor light), white...
USGS Common Moorhen Gallinula chloropus ADULT Can look all-dark, but has dark blue-gray head, neck, and underparts, and brownish back, wings,...	Gavin Keefe Schaefer/CCSA Common Nighthawk Chordeiles minor ADULT MALE Has blackish brown plumage overall. Upperparts are finely marked with fine black and whitish...	David Hofmann/CCSA Common Raven Corvus corax ADULT Has mainly black plumage but, in good light, an oily or metallic sheen is discernible....
Badjoby/CCSA Common Tern Sterna hirundo ADULT SUMMER Has gray upperparts, black cap, and whitish gray underparts. Compared to Arctic, note black-tipped...	Dan Pancamo/CCSA Common Yellowthroat Geothlypis trichas ADULT MALE Has olive-brown nape, back, wings, and tail. Head has broad, black mask, bordered above...	USFWS Connecticut Warbler Oporornis agilis ADULT MALE Has olive-green back, wings, and tail. Has a gray hood, palest on throat and...
Mdf/CCSA Cooper's Hawk Accipiter cooperii ADULT Has dark blue-gray upperparts, darkest on crown and palest on nape (creating capped effect). Underparts...	Tom Allmendinger/CCSA Cory's Shearwater Calonectris diomedea ALL BIRDS (not possible to age birds at sea in our region) Have mainly buffish brown...	Peter Wallack/CCSA Dark-eyed Junco Junco hyemalis All birds have white outer tail feathers and a dark eye. ADULT MALE "Slate-colored" has mostly...