Summary 
A complete lack of quantitative data on blue jay productivity 
currently prevents any satisfactory analyses of population dynamics in 
this species. 
Of the blue jays said to be juvenile at the time of banding, 
6 per cent were banded in May, 21 per cent in June, 33 per cent in 
July, 32 per cent in August, and 8 per cent in September. To obtain 
257 recoveries of juvenile-banded birds, 11) banders ringed h5u7 jays— 
a recovery rate of 5.8 per cent. Birds found dead demonstrated a 
mortality peak that occurred in the spring, especially in May and June. 
This prevented any reliable calculation of a first-year mortality rate 
as of September 1. The mean adult mortality rate was computed as 
4S per cent per year. Band loss perhaps distorted this result slightly. 
The oldest blue jay noted in this study died in its tenth year of life. 
12) 
Sa 
