Getting The Bird

I took a photograph of a bird drying out its wings the other day in Washington Park.  I had no idea birds even did this.  Am I to understand that each time a bird takes a dip in the lake, it has to air out its wings?  Perhaps living the good life in Denver's Washington Park has spoiled the wildlife living there.  More and more ducks and geese are appearing in the park these days.  Once they stop there on their way south, they wind up never leaving. Good weather, lots of food, plenty of water to play in.  Kind of like a lot of Californians who have moved here lately.