Missbirders,
Interesting article on starling murmuration on Cornell website:
https://www.allaboutbirds.org/how-do-starling-flocks-create-those-mesmerizing-murmurations/
Also see a Youtube video of tree swallows here:
https://www.youtube.com/watch?v=VBjxsKNIHD8
Martha
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Martha Swan
Toccopola, Mississippi, USA