94 KEY TO THE BIRDS OF EASTERN NORTH AMERICA. 
* Group 5. Wing, over 15 inches long. 
Plumage, entirely white; wing, over 17 inehes; bill, over 5.50; tarsus, over 7.25. 
Ardea occiuentalis. Great White Heron. 
See No. 148. 
Plumage, entirely white; wing, less than 17 inches long; bill, under 5.50; tarsus, 
o | OF . 
under 7.25. Ardea eyretta. American Egret, 
See No. 153. 
Greater part of upper plumage, bluish gray or slaty gray; adults in breeding have 
middle of crown and throat, white: bill, less than 6.25; immature birds have the top of the 
Ardea herodias. Great Blue Heron. 
See No. 151. 
head, black. 
Similar to Great Blue Heron, but larger; bill, over 6.25. Occurs only in Florida. 
Ardea wardi. Ward’s Heron. 
See No. 150. 
Top of head and sometimes greater portion of head, white; wings and back, bluish gray, 
or slaty gray; general appearance of Ward's Heron except color of head. Occurs only in 
Florida: probably a color phase of Ardea occidentalis. 
Ardea wuerdemanni. Wuerdeman’s Heron. 
See No. 149. 
* For directions for measurement, see page 9. 
