Hundreds of White-throated Needletail over Narrabundah Hill Duffy 3pm

["casburnj" <>]

I first saw these while driving. They were flying over the southern end of Eucumbene Drive and the edges of Narrabundah Hill.  By the time I got home, the bulk of them were circling over my GBS.  I thought they would hang about a bit – but they disappeared up into the clouds quickly and although I watched for them – they did not reappear. 

Some of the flock were hawking low while others circled higher and higher into cloud .  There could easily have been 350 birds.  Should such a large number be entered into my GBS, or would an incidental report be better?