DEVELOPMENT OF A YOUNG KESTEEL. 299 



blood-quills appeared on the tail and wings, the former 

 bursting on the twelfth day, the latter on the thirteenth. 

 Up to this age the area beneath the eye, and extending 

 from the beak to behind the orbit, had been devoid of 

 down, but on the sixteenth day pin-feathers appeared 



FIG. 1. KESTREL. TWENTY-SEVEN DAYS OLD. 



here, bursting the following day ; the scapulars also 

 appeared on the sixteenth day, the feathers of the rump 

 following a day later. At the age of eighteen days 

 the feathers of the flanks, thighs, breast and crown of the 

 head appeared, the tail and wing-coverts and mantle- 

 feathers being apparent on the nineteenth day. I 

 noticed that at this age the down and feather-scale pulled 



