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| Female blue-footed boobies prefer males with the bluest feet. |
| By Nicole Villeneuve |
| Found along the coasts of the Galápagos Islands, Peru, and Mexico, blue-footed boobies are famous for their vividly colored feet. During their summer breeding season, the male birds make sure those feet are on full display with an elaborate courtship dance: They slowly lift one foot, then the other, stepping and strutting around in an effort to impress potential mates. The brighter the blue, it seems, the better his chances; the pigments that give the feet their vivid color come from the male's diet, and those pigments also tend to fade with age, so the intensity of the blue is thought to demonstrate his health and vitality and thus make him more attractive to females. |
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The sky looks bluer in the fall. | |
| Today is the first day of fall, and if you think the sky looks like a deeper blue now than in early summer, it’s not your imagination. While the daytime sky is generally blue throughout the year — save for those overcast gray days — it’s an especially rich hue in autumn. But why? | |
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Original photo by Barisev Roman/ Shutterstock
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