Long-tailed Sylph, Aglaiocercus kingii. With a tail like this, the male Long-tailed Sylph can actually have difficulty flying. This is the result of sexual selection, an evolutionary process where female choice for a trait, in this case the long tail, drives males to have traits that become a hinderance. This ensures that the females choose the strongest male; the one who has proven his health and fitness that he can live well enough to come into breeding condition even with his heavy load.Fundo Alto Nieva, Perú©Two Loons/Erin Lehnert
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