A beekeeper shot this video of her bees washboarding on the front of her hive.
This is a behavior that happens occasionally in a hive. This is a little odd because a large area on the front of the hive has bees doing the behavior. The bees are just moving back and forth.
No one is sure what really causes this, but an interesting behavior.
https://drive.google.com/file/d/0BwbVvr2Z_NOzaXpVQlBUMUNieTQ/view?usp=drivesdk
Video by K. Strupp