F/8.0, 1/250, ISO 250.
White-Cheeked Pintail
What kind of water do you put into a waterbed?
Spring water.
Interesting Fact: It is found in the Caribbean, South America, and the Galápagos Islands.[4] It occurs on waters with some salinity, such as brackish lakes, estuaries and mangrove swamps. ( https://en.wikipedia.org/wiki/White-cheeked_pintail )
Through Open Lens 
That must have been fun for you when you first saw the result of this shot. Nearly identical poses from these Pintails! Great capture.
Synchronized swimming at its best! Great photo! 🙂