ID needed

Not sure what kind of duck this is. Shot today at the Riparian Preserve in Gilbert,Az

female scaup?

Looks like a female Lesser scaup. Greater scaup tend to hang out in more salt water habitats whereas Lesser scaup are often seen on smaller bodies of fresh water. Wing pattern can be a good clue too. Greater scaup have white extending from the secondaries onto the primaries. Lesser scaup usually only have a white bar on their secondaries.

Well captured in flight shots.

Great shots, loving the 1st one