At 16:33 12 January 2017, Duster wrote:
Not a real fan of Facebook, but here is one link

https://www.facebook.com/SoaringSocietyofAmerica/

Quite a remarkable video of one of the gaggles:
Scroll down to see the post by Matthew Scutter and pics by Sean


Howard Jones (uk) described it as
"A knife fight in a phone box"
Plus blue
Plus 32C
Not my idea of fun