A late-ish morning check of Centennial revealed no N. Pintails, 
but did have one female-type C. Goldeneye (at the Wildlife end).
Lots of Hooded Mergs, with Ring-bills poaching from at least one
female, 3 dozen plus Ring-necks, half a dozen Canvasback, three
Ruddies.  

Wilde Lake had only a dozen or so Ring-necks, and a few Ruddies.

Kurt Schwarz
HowCo
goawaybird at comcast dot net