Highest g force experienced by a bird

Highest g force experienced by a bird
Who
Unknown
What
20.9 kilometre(s) per hour
When
01 January 0001
American experiments have shown that the beak of the red-headed woodpecker (Melanerpes erythrocephalus) hits the bark of a tree with an impact velocity of 20.9 km/h (13 mph), subjecting the brain to a deceleration of about 10 g when the head snaps back.
Little research has been done in this field and other woodpeckers may experience an even higher g-force.