Hardhead Aythya australis
Related to the Pochards of Europe, this common diving duck is the only Aythya in Australia and is also known as the White-eyed Duck. The first two photos are males, the nexte a pair and the last is a female.
 




1: Centennial Park, Sydney, 26/09/2009.
2 and 4: Lake Northam, Victoria Park, Sydney, 16/12/2009.
3: Lake Northam, Victoria Park, Sydney, 04/09/2009.
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