FAMILY ARDEID.Z.— HERONS, EGRETS, AND BITTERNS. 93 
* Group 4. Wing, 11 to 15 inches long. 
Bill, stout; top of the head, black; back, dark green (adult). 
Nycticorax nycticorar nevius. Night Heron, 
See No. 159. 
Bill, stout; top of head, white or whitish; back, not green (adult). 
Nycticorax violaceus. Yellow=crowned Night Heron. 
see No. 160. 
Bill, stout; general plumage, mottled and streaked brown and white: outer edge of 
primaries, reddish brown (immature). Nycticorax nycticorax nevius. Night Heron. 
See No. 159. 
Biil, stout; general plumage, mottled and streaked grayish brown and white; primaries, 
slaty brown (immature). Nycticorax violaceus. Yellow=crowned Night Heron. 
See No. 160. 
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General plumage, white; bill, yellow ; legs, black. Ardea egretta. American Egret. 
See No. 153. 
General plumage, white; legs, dark olive: terminal half of bill, black; basal half, 
flesh color (white phase). Ardea rufescens. Reddish Egret. 
See No. 155. 
Head and neck, rufous chestnut; rest of plumage, slate color, or slaty gray. 
Ardea rufescens. Reddish Egret. 
See No. 155. 
General plumage, yellow brown, mottled and streaked with dark brown; upper surface of 
primaries, blackish. Botaurus lentiginosus. American Bittern. 
See No. 145. 
* For directions for measurement, see page 9, 
