HemaShah @raulalsc, what you have is an "Acorn wood pecker" and what Bill has is a "Hairy Wood Pecker". They are different species and hence you may not be able to use the same criteria for differentiating between male and female!
raulalsc She´s a female ! and I have a male woodpecker http://www.projectnoah.org/spottings/5180041 look at the position of the red spot
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