Thanks for looking everyone. :-)
Ospr3y, your identification is spot-on! I thought the four similar ones might be teals, but Ringed Teal didn't come up in my searches.
Also, I don't think I would ever have figured out the White-Faced Whistling Duck.
Now that I have all the birds...
Sorry, apparently Google Docs/Drive is having an intermittent outage at the moment.
https://productforums.google.com/forum/#!category-topic/docs/3Ystum2BOe8
Let's try Google+ in the interim (these are somewhat lower resolution than the docs links above)...
Anyone recognize these ducks?
https://docs.google.com/open?id=0Bx_71HHl7qa7dS1rbU5rdXMxUFU
https://docs.google.com/open?id=0Bx_71HHl7qa7RXNjeWdQREZocDg
The two similar ducklings in the second image appear to be offspring of the pair in the first.
Any help is appreciated.
Thanks,
Rusty