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My dad has been promising for years that if he ever becomes rich, he’ll donate some penguins to the National Zoo. Dad hasn’t struck it rich yet, but zoo officials have at least rectified another longtime deficit: Today is Lemur Day, when the zoo will unveil a troop of eight ring-tailed and two red-fronted lemurs at its new Lemur Island exhibit. Lemursprimates found only in Madagascarare both biologically fascinating and completely adorable. Unlike most primates, ringtails are female-dominated. In fact, some biologists posit a “wimpy male” hypothesis, in which females prefer to mate with less aggressive males so that they can raise their young free of testosterone-fueled annoyances. And lemurs duke it out with each other using the scent glands on their wrists. Stink fights: How cool is that? Join the hands-on activities and special keeper talksor just watch the little critters sun themselvesbeginning at 10 a.m. at the National Zoological Park, 3001 Connecticut Ave. NW. Free. (202) 673-4717. (Louis Jacobson)