Table 4. Numbers of black-legged kittiwakes counted and hours of observation 

 in the northern Chesapeake Bight, 1971-1977. Numbers for each age 

 class (based on plumage characteristics) are listed for each month. 

 Subadults are combined with adults. 



Aae 



Tarrock* 



Total 



189 



2,029 



54 



2 



1 



7 



108 



1,160 



464 

 3,761 

 86 

 6 

 2 

 

 

 



1 



8 

 209 



2,145 



Adults (3 or more years old--Dwight 1925) represent less than 10% of the 



birds in this age group. 



Tarrocks are birds in first winter plumage. 



39 



