A rare patternless giraffe was born last month at a family-owned zoo in Tennessee—and experts say she may be the only completely brown giraffe alive on the planet, report Emily Hibbitts and Clarice Scheele for WJHL. Though her appearance is unusual, the six-foot-tall calf appears healthy and is thriving under her mother’s care, Brights Zoo officials tell the publication. “She is very inquisitive,” David Bright, the zoo’s director, tells Insider’s Fern McErlane and Grace Eliza Goodwin. “She stays very tight with her mom, doesn’t wander off too far, but she’s very curious what’s going on around her. She has a very positive personality when it comes to giraffes.” The calf is a reticulated giraffe (Giraffa reticulata), one of four giraffe species—until 2016, scientists recognized only one species of giraffe. The last known spotless reticulated giraffe was likely Toshiko, a calf born in 1972 in Tokyo, writes Caitlin O’Kane for CBS News. Only two others have ever been recorded—the older sibling of Toshiko and an individual in Uganda, per Insider. “From day one, we’ve been in contact with zoo professionals all over the country,” Bright tells WJHL. “And especially the old timers, that have been around for a long time: ‘Hey, have you seen this? What’s your thoughts?’ And nobody’s seen it.” Fred Bercovitch, a wildlife conservation biologist at Kyoto University and executive director of the nonprofit Save the Giraffes, tells Insider the animal’s color is likely due to a specific genetic mutation. Though many questions have yet to be answered about giraffes and their spots, a calf’s pattern…