NO. 7 



PROTECTIVE ADAPTATIONS McATEE 



127 



kind to the extent of a fourth (26.6 per cent numerically) of all their 

 vertebrate food. The following table shows the distribution to families 

 and two more inclusive groups of the determinations that have thus 

 far been made of birds in the stomachs of nearctic birds. 



Idcntificat'wns of Aves 



Group 

 Birds (furtlicr 



fied) 



Egg-shell 



Colymbidae 



Gaviidae 



Alcidae 



Stercorariidae . . . 



Laridae 



Ryiichopidae .... 

 Diomedeidae .... 

 Procellariidae . . . 

 Phaethontidae . . . 



Sulidae 



Anhingidae 



Phalacrocoracidae 



Pelecanidae 



Fregatidae 



Anatidae 



Phoenicopteridae 



Plataleidae 



Ibididae 



Ciconiidae 



Ardcidae 



Gruidae 



Aramidae 



Rallidae 



Phalaropodidae .. 

 Recurvirostridae . 

 Scolopacidae . . . . 

 Charadiiidae . . . . 



Aplirizidae 



Haematopodidac . 



Jacanidae 



Odontophoridae . 



Tetraonidae 



Phasianidae 



Meleagridae 



Numbi-r of 

 identifications 



tinideiiti- 



301 



463 



6 



26 



19 

 3 



s?, 

 5 



23 

 26 



265 



Percentage of 



identifications 



among those 



of all 



birds 



8.4669 



13.0327 



.1688 



.0844 



•7314 



.0563 



•5.^45 

 .0844 

 •0563 

 1 .49ns 

 .1406 



.6470 



■7314 



7-4542 



Percentage 



of species 



in this group 



among 



nearctic 



birds 1 



•7490 



.6242 



2.7465 



•4994 



5-2433 



.1248 



.6242 



3-8700 



•3745 



.7490 



.1248 



.7490 



.2497 



.1248 



7.2407 



.1248 



.1248 



•4994 

 .2497 



1.7478 

 •3745 

 .1248 



1-9974 

 •3745 

 .2497 



5-2433 

 1.7478 



•4994 

 •4994 

 .1248 



-8739 

 1.7478 



.1248 



' Computed from Check list of North American birds, prepared by a Com- 

 mittee of the American Ornithologists' Union, 3rd ed. (rev.), 430 pp., 1910. 

 9 



