Published June 6, 2018 By Laura Jones, Communications Intern The Duke Lemur Center is ecstatic to announce the birth of siblings Harriot and Helene — a pair of critically endangered black and white ruffed lemurs (Varecia variegata variegata). The twin sisters were born to 5-year-old mom Halley and her 15-year-old mate Ravo on May 6, […]