BIRDS 307 



Order v. Natatores. Divers and swimmers. Legs short, toes webbed. 

 Examples, gull, duck, albatross. 



Order vi. Columhoe. Like Gallinse but with weaker legs. Examples, dove, 

 pigeon. 



Order vii. Picarioe. Woodpeckers. Two toes point forward, two back- 

 ward, and adaptation for climbing. Long, strong bill. 



Reference Books 

 for the pupil, 



Herrick, Text-hook in General Zoology, Chaps. XXII, XXIII. American Bock 



Company. 

 Beebe, The Bird. Henry Holt and Company. 

 Nature Study Leaflets, XXII, XXIII, XXIV, XXV. Cornell University. 



FOR THE TEACHER 



Apgar, Birds of the United States. American Book Company, 



Beebe, The Bird. Henry Holt and Company. 



Bulletins of U.S. Department of Agriculture, Division of Biological Survey, Nos. 1, 



6, 15, 17. See also Year Book, 1899. 

 Chapman, Bird Life. D. Appleton and Company. 

 Riverside Natural History, Vol. IV. Houghton, Mifflin, and Company, 



