That certain glow. (Letters).The concluding comment in "Parrots will fluoresce fluo·resce intr.v. fluo·resced, fluo·resc·ing, fluo·resc·es To undergo, produce, or show fluorescence. [Back-formation from fluorescence. for sex" (SN: 1/19/02, p. 40) that both sexes preferred unsmeared birds doesn't show any support for the researchers' contention that non--UV-blocking smears didn't impact the sexual behavior sexual behavior A person's sexual practices–ie, whether he/she engages in heterosexual or homosexual activity. See Sex life, Sexual life. of birds. M.J. RAICHYK, CINCINNATI, OHIO “Cincinnati” redirects here. For other uses, see Cincinnati (disambiguation). Cincinnati is a city in the U.S. state of Ohio and the county seat of Hamilton County. The researchers had noticed that birds preferred companions of the opposite sex with fluorescent feathers still glowing. But might this just be some general affinity that had nothing to do with mating? The researchers repeated their choice tests offering companions of the same sex. This time, no preference showed up. General affinity looks unlikely then, and the researchers conclude that fluorescence fluorescence (fl  rĕs`əns), luminescence in which light of a visible color is emitted from a substance under stimulation or excitation by light or other forms of electromagnetic probably shines as
a mating signal.
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