APPENDIX A 



ggggg. Breast whitish; belly with blackish 



band Rough-legged Hawk, 

 gggggg. Breast gray and buffy; upper side of 

 tail bright rufous; length 21 in. 

 Red-tailed Hawk, 

 bb. Owls, 

 c. With ear tufts. 



d. Length under 10 in. Screech Owl. 

 dd. Length over 10 in. 



e. Under parts with cross-bars; ear tufts conspicu- 

 ous. 



f. Length over 20 in. Great Horned Owl. 

 ff. Length over 20 in. Long-eared Owl. 

 ee. Under parts without cross-bars; ear tufts in- 

 conspicuous Short-eared Owl. 

 cc. Without ear tufts. 



d. Length under 10 in. Acadian Owl. 

 dd. Length over 15 in. 

 e. Entirely white, with black or brown markings 



Snowy Owl. 



ee. Upper part rich buffy-ruf ous ; breast creamy- 

 buff with a few spots Barn Owl. 

 eee. Upper parts grayish brown; breast heavily 

 marked with cross-bars; belly streaked 

 Barred Owl. 



aaa. Aquatic and Game Birds, 

 b. Under parts uniform white, grayish-white or buffy- 



white. 



c. Entire head pure white, 

 d. Back black; length 30 in. Great Black-backed 



Gull. 



dd. Back pearl gray. 

 e. Length 24 in. Herring Gull, 

 ee. Length 19 in. Ring-billed Gull, 

 cc. Head not entirely white. 

 d. Crown black Black-crowned Night Heron, 

 dd. Crown not black. 



e. Bill long and bright yellow Least Bittern, 

 ee. Bill dark and length 3 in. Loon, 

 eee. Bill dark and under I in. 



79 



