[cobirds] dark duck in Pueblo 12/18 and 12/20

Hi all,

I photographed a dark duck along the Arkansas River, below Pueblo Reservoir dam on both 18 Dec and 20 Dec.  I'm not sure if the these four photos are of the same bird, or not.  I would guess they are.  I'm interesting in hear what people think about this bird(s).

https://www.flickr.com/photos/brandonsbirdphotos/sets/72157649465165477/

 

Thanks,

Brandon Percival
Pueblo West, CO