Theo asks
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You ever get any Buffleheads there? We've had them here twice in 6 years.

Not that we have witnessed...yet. We didn't have the bird-book with us during our visit, so I thought that these guys were Buffleheads...until we got home and studied up.
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Cecil notes
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Wow they are gorgeous birds though!

Yeah, they really are. They are going through the courtship rituals, so we observed
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Males perform courtship rituals and displays, including crest-raising, head-shaking, head-throws, and head-pumping.

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Here's another pic of a female and male.