Prob hybrid dark ibis in Colo

Since the small flock of Plegadis ibis were moving around as they were feeding in the flooded agricultural field, I cannot say if these are from different or from the same bird. In the lower pic there is an additional Glossy Ibis field mark showing that does not show in other pics. In his book Advanced Birding Kaufman states, " the shape of the pale border on Glossy Ibis is quite consistent. The upper border widens between the eye and the bill . . . ." (p.40) Kaufman also notes that Glossy Ibis "retain at least a hint of this pale edging all year" and each of these pics in this post and in the previous post show pale edging which looks slightly bluish to me. There are other field marks such as very small size difference and leg color that seem less reliable for separating these two species in winter. (click on each pic to further enlarge) I looked on the internet for pics of White-faced Ibis in Basic plumage and this webpage (JohnAvise, CA) can be enlarged nicely to show the difference to my pics. SeEtta (Note: to reduce issues for id, only editing was cropping to enlarge ibis pics , no color corrections or lighting changes,etc--just hard daylight at 1:30 pm on sunny day)

Post note: H. David Pratt has reviewed photos and says he believes it is probably a hybrid GlossyXWhite-facied. Dr. Pratt, who is the Research Curator of Birds at North Carolina Museum of Natural Sciences and who has who provided species accounts of both of these in the The Audubon Society master guide to birding, is a respected contributor to Bird Id Frontiers. In his email to me Dr Pratt said he was traveling and would send me his detailed analysis when he returns home next week. I will ask his permission to share his remarks.