Gender is in the Eye of the Boobie

From a distance, male and female Blue-Footed Boobies look virtually identical:
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But if you get close, you can tell them apart by their eyes.
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Female boobies will appear to have larger pupils than males. The pupils are not actually any bigger, but female boobies have a ring of dark pigment around their pupils which the males lack, giving the illusion that their pupils are larger. In the image above, the female is on the right.

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