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Mallard Duck (Anas platyrhynchos). Shadow Cliffs Regional Park - Pleasanton, CA, USA
Mallard Ducks (Anas platyrhynchos). Arroyo Del Valle Trail - Pleasanton, CA, USA
Hybrid Duck (Believed to be a cross between a Mallard Duck and Brandt's Cormorant). Fremont Central Park - Fremont, CA, USA
Mallard Duck (Anas platyrhynchos). Fremont Central Park - Fremont, CA, USA
Mallard Duck (Anas platyrhynchos). Lake Elizabeth/Fremont Central Park - Fremont, CA, USA
Female Mallard Duck (Anas platyrhynchos). Fremont Central Park - Fremont, CA, USA
Female Mallard Duck (Anas platyrhynchos). Lake Elizabeth/Fremont Central Park - Fremont, CA, USA
