90 



LIST OF FIGURES 



Number Title Page 



1 Range of the Ruffed Grouse 49 



2 Distribution of Recent Records of Ruffed Grouse Over Its Former Range 



IN THE North-Central and Mid-Western States 51 



3 Relative Abundance of the Ruffed Grouse Throughout Its Present Range 55 



4 Structure of the Fresh and of the Developing Grouse Egg 74 



5 Annual Chances in Shell Thickness of Grouse Eggs Collected from the 



Ithaca, New York. Region^1936-1940 75 



6 Annual Changes in the Weight without the Yolk Sac of Newly Hatched 



Grouse Collected frow the Ithaca, New York, Region — 1936-1947 77 



7 Grouse Development from Hatching to Adulthood 82 



8 Progression of Wing Feather Development in Young Grouse 87 



9 Relative Development at Weekly Intervals of Wing Feathers of Young 



Grouse 



10 Average Seasonal Weights of 394 Adult and 108 Young, Wild Grouse 



from New York 92 



11 Seasonal Weight-Health Relationship of Adult Grouse 96 



12 Grouse Chick Calls ^^ 



13 Parts of New York State Most Typical of the Three Major Grouse Habi- 



tat Regions and the Location of the Investigation's Study Areas in 

 Each H ^ 



14 Distribution of Adult Grouse Flushes on One Compartment of the Con- 



necticut Hii.L Study Area All Seasons— 1932-1940 171 



15 Distribution of Adult Grouse Flushes on the Adirondack Study Area— All 



Seasons- 1932-1941 . I"-' 



16 Food Groups Taken bv 1.093 Am lt Grouse \t \ vuious Seasons 211 



17 Seasonal Variations in the Amount of Some Important Foods Consumkd in 



1.093 Adult Grouse in New York 21<i 



18 Amount and Kind of Food F\tkn by 540 Grouse Chicks during June. July 



AND AuGU.sT 



19 Composition of Fight Spkin(, Foods Important to Grouse 237 



20 Differences in (^ompo.sition of Yi:i.L(n\ I5in( ii Bins with Respect to the 



Age of the Tree and the Part from W hich Thev were Collected 240 



21 I'er Cent of Moisture Present in Eight Foods Import \\t to Grouse in the 



Spring 244 



22 Distribution of Brood Flushes on One Compartment of the Connecticut 



Mill Sti dy Area during Wet as Compared with Dry Years 21.'i 



23 Relationship of the Sum of the Deviations from the Means of March 



and June Temperatures (IT. S. Weather Bureau RecordsI to the Re- 

 ported Onset of Periods of Grouse Scarcity in New York State 305 



24 Yearly Variations in Grouse Nest Mortality on Connecticut Hill Area 



AS Compared with Entire State — 1931-1941 '^'2 



25 Interrelation of Grouse Nest Mortality with Fox Activity and Buffer 



Abundance — Connecticut Hill Area — 1931-1941 ■'^1 I 



223 



