I have seen large mixed species Rosy Finch flocks on the brushy slopes of North Table Mountain here in Golden in winter feeding the way you described. I'm not sure if other finches would do this too, but the "rolling over" of the back ones flying over the front ones as you described is my exact experience also. It can make it surprisingly difficult to key in on getting views of the individuals.
On Thursday, January 13, 2022 at 4:33:56 PM UTC-7 ouz...@aol.com wrote:
No one reacted to my description of a mystery flock that Urling and I saw. We watched about 100 small birds feeding on a brushy hillside. The birds in back kept flying over the front ones -- until they all took off for parts unknown. I thought they sounded like Rosy-finches, but Urling saw stripey breasts.
Do any of you have experience with flocking birds that act this way?
Hugh
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