COMMON 

 TERN 



MONTH 

 APRIL I MAY . JUNE . JULY | AUG. 



SEPT. 



AR 



RIVAL < ^ 1 '^ 



EGG LAYING <^ ] ^ 

 INCUBATION ^ 



BROODING 



^ ■ > 



FLEDGING 



< r—r-> 



ARCTIC & 

 ROSEATE 

 TERNS 



SIMILAR TO ABOVE 



LEAST 

 TERN 



AR 



RIVAL < ^ 2 



EGG LAYING ^ f 

 INCUBATION 



BROODING < r ^ Z ^ 



FLEDGING < C ^ ^ 



REFERENCE: 



1 Palmer 1941 



2 P. Grace (unpublished) 



Figure 7. Estimated breeding chronology of four species of terns nesting in Maine. 



42 



