Duck !

No, these are not ducks. These are African Vultures taking part in a flying display at the Hawk Conservancy here in Hampshire. We visit there many times and always have a great time.
"Duck" was a warning from the presentator to the audience for when the birds were flying low. Apart from watching these amazing birds, it was funny to see the spectators doing a "reverse" Mexican Wave every time they flew over.
Hawk Conservancy