Can you be fooled man or woman

Only about a fifth of adult females manage the feat, but those that do are nearly indistinguishable from males, from the tops of their cerulean heads to the tips of their brilliant white tails.

Experts like Falk can differentiate the birds up close by inspecting very subtle traits or taking blood samples. Starting in , Falk, then a graduate student at Cornell, began taking regular trips to Panama to watch the birds interact. He set up nectar-spouting feeders to attract them, and cameras to document them flitting back and forth.

He spied them pinwheeling through the air, cavorting around one another, and executing Olympic-caliber flips mid-flight. But most of all, he saw them aggressively and relentlessly chasing each other.

Grayer jacobins, he noticed, were almost always the quarry, with bluer birds in pursuit. The pattern repeated when Falk stationed pairs of taxidermied jacobins at the feeders for live birds to inspect. Each day of the experiment, he offered the birds a choice. Sometimes, it was between a gray-green female and a blue male; other times, a gray-green female and a blue female; and still others, a blue female and a blue male.

American Heart Association. Lockyer S, et al. Coconut oil — A nutty idea? Nutrition Bulletin. Eyres L, et al. Coconut oil consumption and cardiovascular risk factors in humans. Nutrition Reviews. Mozaffarian D. Dietary fat. Frie KS expert opinion. Mayo Clinic, Rochester, Minn. March 8, Mohebi-Nejad A, et al.

Omega-3 supplements and cardiovascular disease. Aung T, et al. Associations of omega-3 fatty acid supplement use with cardiovascular disease risks. JAMA Cardiology. See also The power of a plant-based diet for heart health The real secret to a healthy heart. Mayo Clinic Press Check out these best-sellers and special offers on books and newsletters from Mayo Clinic. ART Home Don't get tricked by these 3 heart-health myths. Legal Conditions and Terms Any use of this site constitutes your agreement to the Terms and Conditions and Privacy Policy linked below.

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