The specific habits of the White-necked hummingbird (white-necked Jacobin, Florisuga mellivora) are unknown.
White-necked hummingbirds begin to display flamboyant coloration before they reach reproductive age, and this coloration is less prevalent in adult females - while about 20% of adult females still retain the same coloration as males, most females shed their flamboyant plumage and become dull as they mature. Male white-necked hummingbirds prefer to court and mate with dulled females, suggesting that bright coloration does not give females any advantage in courtship. For showy, white-necked hummingbird chicks, their coloration may have the same benefits as showy females, helping them avoid harassment and compete for nectar.
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