:(
Their feet are blue because of their diets. I can't remember exactly what it is, but I'm guessing they feed on blue krill, and well, you are what you eat! (I should probably look that up later but I'm busy now). I could never eat a blue-footed booby though. They're too cute! >_<
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Courtesy of fr0q - http://img.imgcake.com/gensagajpgqe.jpg
Punny worked hard on this! - http://img.imgcake.com/Punny/Gennypngas.png