Drake as Nike

I've always enjoyed those seemingly random moments 

when ducks and geese rise out of the water for a few seconds, 

flap their wings for the seeming joy of it, then settle 

back down to chortle and paddle around with their buddies.

But after watching this particular flock of mallards, 

the wing flapping didn't seem random after all;

each time a bird dipped it's head in the water three

or four times, it would rise up afterward

to flap its wings. Is it part of their grooming

routine, or a temperature control behavior?

Whatever the reason, I think it's pretty.