[Apologies to those who have seen this question already before at other venues. Some have said that this is an "obvious Greater", but I'm still interested in opinions on such a clear eye-ring for a White-fronted Goose.]
Last week a birder friend of mine photographed two White-fronted Geese at Castaic Lagoon near Los Angeles, California, and one of them had an obvious yellow eye-ring. In most parts of Europe this would make it a contender to be a Lesser White-fronted Goose (as opposed to a Greater) but here in California that would be unheard-of (my National Geographic guide mentions only one US sighting in Alaska in 1994). For those not familiar with the English American names of geese: I'm talking about Anser albifrons versus A. erythropus here.
You can look at her photos of the two White-fronted Geese here: http://tinyurl.com/yht3py7
The bird does appear a bit smaller than the other WfG but its beak seems too big and not pink enough for a Lesser. This week I learned from Collins that Greater WfG sometimes have a narrow eye-ring, something my American guides do not mention. So, all in all, this is most likely a Greater White-fronted Geese with a yellow eye-ring, but before putting this ID to a rest I would like to have some confirmation from those of you who have more experience with the Lesser versus Greater Wf Goose question.
Specifically, is this indeed the kind of narrow eye-ring that some Greater WfG have?