While attempting to fly formation with a golden eagle cruising along the ridge I couldn't get the glider quite slowed to its speed, about 45mph, and "goosed" it with my left wing. It rolled over the top of the wing, recovered and continued it's mission.

Eagles aren't quite as heavy as Griffon vultures but could do similar damage if the collision speed were higher.

A couple videos of these birds: https://www.bing.com/videos/search?q...3A&FORM=VDQVAP

https://www.bing.com/videos/search?q...953A&FORM=VIRE

Karl Striedieck