For those who want to get immersed in duck identification but feel as though they are getting in over their heads, birder Claus Holzapfel offers this helpful photo.
The two teal on the left are "regular" Green-winged Teal. The one on the right is a Eurasian Green-winged (or common) Teal. Got that?
P.S. Both types of the GW Teal have been feeding side by side near low tide in the tidal impoundment south of the main parking lot at DeKorte on Monday and Tuesday.
A previous G-W Teal post (with a right-side-up view) is here.